John Rennie (engineer)
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John Rennie (7 June 1761 – 4 October 1821) was a Scottish
civil engineer A civil engineer is a person who practices civil engineering – the application of planning, designing, constructing, maintaining, and operating infrastructure while protecting the public and environmental health, as well as improving existing i ...
who designed many bridges,
canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface ...
s, docks and warehouses, and a pioneer in the use of structural cast-iron.


Early years

John Rennie was born near Phantassie in Haddingtonshire (present day
East Lothian East Lothian (; ; ) is one of the 32 council areas of Scotland, as well as a Counties of Scotland, historic county, registration county and Lieutenancy areas of Scotland, lieutenancy area. The county was called Haddingtonshire until 1921. In ...
). He was the youngest son of James Rennie, a farmer and brewer. He attended the parish school at Prestonkirk. He showed an interest in machinery from an early age, and came to the attention of
Andrew Meikle Andrew Meikle (5 May 1719 – 27 November 1811) was a Scottish mechanical engineer credited with inventing the threshing machine, a device used to remove the outer husks from grains of wheat. He also had a hand in assisting Firbeck in the inv ...
, a
millwright A millwright is a craftsman or skilled tradesman who installs, dismantles, maintains, repairs, reassembles, and moves machinery in factories, power plants, and construction sites. The term ''millwright'' (also known as ''industrial mechanic'') ...
and the inventor of the
threshing machine A threshing machine or a thresher is a piece of agricultural machinery, farm equipment that separates grain seed from the plant stem, stalks and husks. It does so by beating the plant to make the seeds fall out. Before such machines were developed ...
, who lived on the Phantassie estate. At the age of twelve, Rennie started to work for Meikle, getting a grounding in practical mechanics. From 1775 to 1777, he attended high school in
Dunbar Dunbar () is a town on the North Sea coast in East Lothian in the south-east of Scotland, approximately east of Edinburgh and from the Anglo–Scottish border, English border north of Berwick-upon-Tweed. Dunbar is a former royal burgh, and ...
. In 1779, with the support and approval of Meikle, he set up in business on his own account as a millwright. One of his first jobs was to construct a mill for his oldest brother, George Rennie. From 1780 to 1783, while still working as a millwright, he attended the
University of Edinburgh The University of Edinburgh (, ; abbreviated as ''Edin.'' in Post-nominal letters, post-nominals) is a Public university, public research university based in Edinburgh, Scotland. Founded by the City of Edinburgh Council, town council under th ...
. In 1783 he undertook a journey through England, studying the canals, bridges, and machinery that he encountered on the way. In
Birmingham Birmingham ( ) is a City status in the United Kingdom, city and metropolitan borough in the metropolitan county of West Midlands (county), West Midlands, within the wider West Midlands (region), West Midlands region, in England. It is the Lis ...
, he visited
James Watt James Watt (; 30 January 1736 (19 January 1736 OS) – 25 August 1819) was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1776, which was f ...
, who employed him as a millwright at his Soho works. This was the start of an association between Watt and Rennie which would last until Watt's death in 1819. In 1784, after a short stay at the Soho works, he left for London, where he was put in charge of the machinery that Boulton & Watt were supplying to the Albion Mills. A distinguishing feature of the machinery was that the wheels and shafts were made of iron rather than wood. Rennie's appointment had been made on the understanding that he could undertake work for other clients. As a result, he obtained commissions from flour mills, breweries and distilleries, and later sugar mills. In 1791, the Albion Mills were destroyed by fire. But by then Rennie's business was well established. He was supplying machinery for mills, breweries, and factories of all kinds both in Britain and abroad, working from workshops that he had built on part of the Albion site. In 1810 these were extended into neighbouring Holland Street.


Canals and waterways

Rennie's business expanded into civil engineering, particularly the construction of
canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface ...
s. His early projects included the Stowmarket Navigation (
River Gipping The River Gipping is the source river for the River Orwell in the county of Suffolk in East Anglia, England, which is named from the village of Gipping, and which gave its name to the former Gipping Rural District. It rises near Mendlesham, Men ...
) in 1791, the
Lancaster Canal The Lancaster Canal is a canal in North West England, originally planned to run from Westhoughton in Lancashire to Kendal in south Cumbria (Historic counties of England, historically in Westmorland). The section around the crossing of the River ...
(started 1792), the Chelmer and Blackwater Navigation (1793), the
Crinan Canal The Crinan Canal is a Canals of the United Kingdom, navigable canal in Argyll and Bute, west of Scotland. It opened in 1801 and connects the village of Ardrishaig on Loch Gilp with Crinan, Argyll, Crinan on the Sound of Jura, providing a navi ...
(1794–1801),
Rudyard Lake Rudyard Lake is a reservoir in Rudyard, Staffordshire, located north-west of the town of Leek, Staffordshire. It was constructed in the late 18th century to feed the Caldon Canal. During the 19th century, it was a popular destination for day ...
(1797) and the
Rochdale Canal The Rochdale Canal is in Northern England, between Manchester and Sowerby Bridge, part of the connected system of the canals of Great Britain. Its name refers to the town of Rochdale through which it passes. The Rochdale is a broad canal be ...
, which passes through difficult country between
Rochdale Rochdale ( ) is a town in Greater Manchester, England, and the administrative centre of the Metropolitan Borough of Rochdale. In the United Kingdom 2021 Census, 2021 Census, the town had a population of 111,261, compared to 223,773 for the wid ...
and
Todmorden Todmorden ( ; ) is a market town and civil parish in the Upper Calder Valley in Calderdale, West Yorkshire, England. It is north-east of Manchester, south-east of Burnley and west of Halifax, West Yorkshire, Halifax. In 2011, it had a popul ...
(1799). The
Kennet and Avon Canal The Kennet and Avon Canal is a waterway in southern England with an overall length of , made up of two lengths of Navigability, navigable river linked by a canal. The name is used to refer to the entire length of the navigation rather than sol ...
– including the
Dundas Aqueduct Dundas Aqueduct () is an aqueduct in England which carries the Kennet and Avon Canal over the River Avon (the Somerset / Wiltshire border) and the Wessex Main Line railway. The aqueduct is near Monkton Combe, Somerset, and is about south-east ...
,
Caen Hill Locks Caen Hill Locks () are a flight of 29 locks on the Kennet and Avon Canal, between Rowde and Devizes in Wiltshire, England. Of the 107 locks on the canal, those at Caen Hill are numbered 22 to 50, and they are near the canal highpoint at Ca ...
and Crofton Pumping Station – occupied him between 1794 and 1810. In 1802 he revised the plans for the
Royal Canal of Ireland The Royal Canal () is a canal originally built for freight and passenger transportation from Dublin to Longford in Ireland. It is one of two canals from Dublin to the River Shannon and was built in direct competition to the Grand Canal. T ...
from
Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...
to the Shannon near
Longford Longford () is the county town of County Longford in Ireland. It had a population of 10,952 at the 2022 census. It is the biggest town in the county and about one third of the county's population lives there. Longford lies at the meeting of ...
. He also served as advisor to Dublin Corporation's Pipe Water Committee, for which he was presented with the Freedom of the City of Dublin in 1804. For many years he was engaged in extensive drainage operations in the Lincolnshire and Norfolk Fens (1802–1810), and in the improvement of the
River Witham The River Witham is a river almost entirely in the county of Lincolnshire in the east of England. It rises south of Grantham close to South Witham at , passes through the centre of Grantham (where it may be closely followed using the Riversi ...
. The Eau Brink Cut, a new channel for the River Ouse, was completed just before his death. He was also chief engineer for the canal and major, but abortive lazaret at Chetney Hill, on the
River Medway The River Medway is a river in South East England. It rises in the High Weald AONB, High Weald, West Sussex and flows through Tonbridge, Maidstone and the Medway conurbation in Kent, before emptying into the Thames Estuary near Sheerness, a to ...
estuary in
Kent Kent is a Ceremonial counties of England, ceremonial county in South East England. It is bordered by Essex across the Thames Estuary to the north, the Strait of Dover to the south-east, East Sussex to the south-west, Surrey to the west, and Gr ...
.


Bridges

Over the next few years Rennie also attained a deserved reputation as a builder of bridges, combining stone with new cast-iron techniques to create previously unheard-of low, wide, elliptical arches. The first
Waterloo Bridge Waterloo Bridge () is a road and foot traffic bridge crossing the River Thames in London, between Blackfriars Bridge and Hungerford Bridge and Golden Jubilee Bridges. Its name commemorates the victory of the British, Dutch and Prussians at the ...
(then known as the Strand Bridge), over the River Thames in London (1811–1817), with its nine equal arches and perfectly flat roadway, is thought to have been influenced by Thomas Harrison's design of
Skerton Bridge Skerton Bridge is a road bridge carrying the southbound lanes of the A6 road (England), A6 road over the River Lune in Lancaster, Lancashire, Lancaster, Lancashire, England. The bridge is recorded in the National Heritage List for England as a d ...
over the
River Lune The River Lune (archaically sometimes Loyne) is a river in length in Cumbria and Lancashire, England. Etymology Several elucidations for the origin of the name ''Lune'' exist. Firstly, it may be that the name is Brittonic languages, Brittonic ...
in
Lancaster Lancaster may refer to: Lands and titles *The County Palatine of Lancaster, a synonym for Lancashire *Duchy of Lancaster, one of only two British royal duchies *Duke of Lancaster *Earl of Lancaster *House of Lancaster, a British royal dynasty ...
. In Leeds he was commissioned to build two stone bridges, one over the River Aire and a second smaller structure over the Leeds & Liverpool Canal, to the west side of the town centre and upstream from Leeds Bridge. The main instigator of this scheme was mill owner Benjamin Gott, who had properties on both sides of the waterways and wanted an easier route between them. The larger bridge was described as 'a beautiful structure, consisting of an elliptical arch of one hundred feet span'. The bridge, initially known as Waterloo Bridge, was soon renamed Wellington Bridge. Rennie's later efforts in this line also show that he was a skilful architect, endowed with a keen sense of beauty of design.
Waterloo Bridge Waterloo Bridge () is a road and foot traffic bridge crossing the River Thames in London, between Blackfriars Bridge and Hungerford Bridge and Golden Jubilee Bridges. Its name commemorates the victory of the British, Dutch and Prussians at the ...
was considered his masterpiece and was the most prestigious bridge project in England, described as 'perhaps the finest large masonry bridge ever built in this or any other country'. The Italian sculptor Canova called it 'the noblest bridge in the world' and said that 'it is worth going to England solely to see Rennie's bridge.' After Rennie's death,
London Bridge The name "London Bridge" refers to several historic crossings that have spanned the River Thames between the City of London and Southwark in central London since Roman Britain, Roman times. The current crossing, which opened to traffic in 197 ...
was built from his design by his sons John Rennie (junior) and George Rennie. It replaced the medieval bridge which was proving a serious impediment to the flow of the river. Rennie's bridge was eventually moved to Arizona.
Southwark Bridge Southwark Bridge ( ) is an arch bridge in London, for traffic linking the district of Southwark and the City of London, City across the River Thames. Besides when others are closed for temporary repairs, it has the least traffic of the List of ...
(1815–1819) was built as three cast-iron spans over the river. He also designed the Old Vauxhall Bridge.


Docks and harbours

Rennie was also responsible for designing and building docks at Hull, Liverpool,
Greenock Greenock (; ; , ) is a town in Inverclyde, Scotland, located in the west central Lowlands of Scotland. The town is the administrative centre of Inverclyde Council. It is a former burgh within the historic county of Renfrewshire, and forms ...
, London (
London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
,
East India East India is a region consisting of the Indian states of Bihar, Jharkhand, Odisha and West Bengal and also the union territory of the Andaman and Nicobar Islands. The states of Bihar and West Bengal lie on the Indo-Gangetic plain. Jharkhan ...
and
West India Western India is a loosely defined region of India consisting of western states of Republic of India. The Ministry of Home Affairs in its Western Zonal Council Administrative division includes the states of Goa, Gujarat, and Maharashtra al ...
docks), and
Leith Leith (; ) is a port area in the north of Edinburgh, Scotland, founded at the mouth of the Water of Leith and is home to the Port of Leith. The earliest surviving historical references are in the royal charter authorising the construction of ...
and improving the harbours and dockyards at Chatham, Devonport,
Portsmouth Portsmouth ( ) is a port city status in the United Kingdom, city and unitary authority in Hampshire, England. Most of Portsmouth is located on Portsea Island, off the south coast of England in the Solent, making Portsmouth the only city in En ...
,
Holyhead Holyhead (; , "Cybi's fort") is a historic port town, and is the list of Anglesey towns by population, largest town and a Community (Wales), community in the county of Isle of Anglesey, Wales. Holyhead is on Holy Island, Anglesey, Holy Island ...
,
Ramsgate Ramsgate is a seaside resort, seaside town and civil parish in the district of Thanet District, Thanet in eastern Kent, England. It was one of the great English seaside towns of the 19th century. In 2021 it had a population of 42,027. Ramsgate' ...
,
Sheerness Sheerness () is a port town and civil parish beside the mouth of the River Medway on the north-west corner of the Isle of Sheppey in north Kent, England. With a population of 13,249, it is the second largest town on the island after the nearby ...
,
Howth Howth ( ; ; ) is a peninsular village and outer suburb of Dublin, Republic of Ireland, Ireland. The district as a whole occupies the greater part of the peninsula of Howth Head, which forms the northern boundary of Dublin Bay, and includes the ...
and Dunleary. He devoted much time to the preparation of plans for a government dockyard at
Northfleet Northfleet is a town in the borough of Gravesham in Kent, England. It is located immediately west of Gravesend, and on the border with the Borough of Dartford. Northfleet has its own railway station on the North Kent Line, just east of Ebbsf ...
, but they were not carried out.


Dunleary

Dunleary harbour of 'Asylum' was a very difficult and important project, because it was critical to maintain an effective communication link between Ireland and London, the seat of government. Rennie was responsible for the construction of Howth Harbour on the North side of Dublin bay a decade earlier. This was originally planned as the landing for the Holyhead packets, but it silted up to such an extent that it became unfit for purpose. An Act of Parliament of 1816 ( 56 Geo. 3. c. 62) authorised the building of Dunleary harbour. Originally it was intended that only one pier (the East Pier) would be built (3,500 feet long), but when John Rennie was appointed directing engineer for the work, he insisted that a single pier would result in sand drifting behind the pier and that a second West Pier (4,950 feet long) would prevent this from occurring. He was correct as the sand has built up behind the west pier. The harbour once built was renamed 'The Royal Harbour of Kingstown' in 1821 on the occasion of the visit of
George IV George IV (George Augustus Frederick; 12 August 1762 – 26 June 1830) was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 29 January 1820 until his death in 1830. At the time of his accession to the throne, h ...
. The material for the harbour is
Dalkey Hill Dalkey Hill ( ; ) is the northernmost of the two hills which form the southern boundary of Dublin Bay (the other being Killiney Hill). Dalkey Hill is 140 metres high and has views over the surrounding areas : Dublin to the northwest; the Irish ...
granite Granite ( ) is a coarse-grained (phanerite, phaneritic) intrusive rock, intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly coo ...
. The granite was provided by Richard Toucher (a long time campaigner for the new harbour) at no cost to the construction team. The foundations of the piers are 300'-0" wide and 24'-0" below low water level. Many options were considered for the width of the space between the two pier heads. Rennie wrote to the Harbour Commissioners that the opening should be 430'-0" wide with the pier heads turned into the harbour to control swells within the harbour. His demands were never met and the harbour opening was built at 1,066'-0". This was clearly too wide and was subsequently reduced to 760'-0".


Custom House Docks and the CHQ Building, Dublin

One of John Rennie's last projects was the construction of the Custom House Docks in Dublin, along with its locks and warehouses, including the CHQ Building where he pioneered the use of cast-iron in the early 19th century. Rennie was first invited to work on the scheme in 1809 by John Foster, the Irish Chancellor of the Exchequer. The first stone of the docks was laid in May 1817; they were formerly opened at the end of August 1821 in front of 'a most select company of Noblemen, Bishops, Ladies, &c.' In 1824 the docks were placed on a long-term lease to Harry and John Scovell, and their nephew George. Harry and John were the younger brothers of Sir George Scovell, the intelligence officer famed for cracking Bonaparte's secret codes during the Napoleonic Wars. By March 1820, Rennie was seeking 33 tons of structural cast-iron, along with a large quantity of wrought iron, for the purpose of building a "Tobacco Warehouse, with the Spirit Stores under it." The iron was supplied by the Butterley Iron Company from Derbyshire. However, an obituary of Shropshire-born engineer and iron founder William Hazeldine from 1841 claimed that Hazeldine also supplied 'the Iron Roofs for the Dublin Custom House and Store Houses.' In 1821, John James Macgregor noted: 'The tobacco stores have been finished on the south side at the expense of £70,000. They are 500 feet long by 160 feet wide. The roof is of cast iron, and the building finished in the most permanent manner.' In 1821, the Rev. George Newenham Wright, an Anglican clergyman, likewise noted: :To the east of the new basin is the tobacco store (500 feet by 160, and capable of containing 3,000 hogsheads), the plan of which was given by John Rennie, Esq. In this store, which is now completed and in use, there is not one particle of wood or other combustible matter. There are nine vaults beneath, which altogether afford perfect and convenient storage for 4,500 pipes of wine, allowing a walk behind the heads of the pipes as well as between them; these vaults are lighted by means of thick lenses set in iron plates in the floor of the tobacco store; but this is not sufficient to supersede the necessity of candle light. The interior of the tobacco store is extremely curious and interesting: the roof is supported by metal frame-work of an ingenious construction, and, at intervals, long lanterns are inserted, the sashes of which are also metal; the entire frame-work is supported by three rows of cylindrical metal pillars, 26 in each row; these rest upon others of granite, which are continued through the stone floor into the vaults beneath. All the iron-work was manufactured at the Butterley foundry in Derbyshire. The only inconvenience at present felt in this store is the excessive heat, which, in all probability, can be remedied by a proper system of ventilation. Now known as the CHQ Building, the tobacco store is home to various enterprises including EPIC – The Irish Emigration Museum and Dogpatch Laboratories.


Donaghadee

Donaghadee Donaghadee ( , ) is a small town in County Down, Northern Ireland. It lies on the northeast coast of the Ards Peninsula, about east of Belfast and about six miles (10 km) south east of Bangor, County Down, Bangor. It is in the Civil paris ...
is probably best known for its lighthouse and harbour. For centuries, it has been a haven for ships, and the harbour has been there from at least the 17th century.
Sir Hugh Montgomery Sir Hugh Montgomery, 1st Viscount Montgomery of the Great Ards (c. 1560 – 15 May 1636) was an aristocrat and a soldier, known as one of the "founding fathers" of the Ulster-Scots along with Sir James Hamilton, 1st Viscount Claneboye. Montgomery ...
built a large stone quay to accommodate vessels ferrying between Scotland and Ireland from 1616 onwards. Viscount Montgomery's harbour (1626; improved 1640), superseding what had hitherto been probably only a small jetty, was built and maintained as a result of the Royal Warrant of 1616 which limited travel between the Ards and the Rhins of Galloway to this port, and that at
Portpatrick Portpatrick is a village and civil parishes in Scotland, civil parish in the historical county of Wigtownshire, Dumfries and Galloway, Scotland. It is located on the west coast of the Rhins of Galloway. The parish is about in length and in br ...
also owned by Montgomery. It was described by Harris in 1744 as 'a curving quay about 400 feet (120m) long and 22 feet (6.7m) wide built of uncemented stones'. It ran from the shore at the north end of the Parade in a broad arc, bent against the open sea, towards the southern end of the present north pier. Much patched and decrepit, the quay was virtually rebuilt, though along the original line, between 1775 and 1785 by the landlord, Daniel Delacherois, probably with the help of
John Smeaton John Smeaton (8 June 1724 – 28 October 1792) was an English civil engineer responsible for the design of bridges, canals, harbours and lighthouses. He was also a capable mechanical engineer and an eminent scholar, who introduced various ...
, the distinguished civil engineer who had made earlier more elaborate plans for extending the harbour, and who had just rebuilt Portpatrick harbour. The old quay remained until after the completion of the new harbour, and then, despite its continued favour by local fishermen, was removed for local wall building about 1833 (it appears in the 1832 drawing but not on the first O.S. map of 1834). The foundation stone of the new harbour was laid by the
Marquess of Downshire Marquess of Downshire is a title in the Peerage of Ireland. It was created in 1789 for Wills Hill, 1st Earl of Hillsborough, a former Secretary of State. Hill had already been created Earl of Hillsborough and Viscount Kilwarlin of County Down ...
on 1 August 1821. The initial plans and surveys for this ambitious undertaking were made by John Rennie. He, however, died within two months of work beginning, and was succeeded by his son, John, who had as his resident engineer a fellow Scot, the seasoned marine builder, David Logan, who had assisted Robert Stevenson at the
Bell Rock Lighthouse The Bell Rock Lighthouse, off the coast of Angus, Scotland, is the world's oldest surviving sea-washed lighthouse. It was built between 1807 and 1810 by Robert Stevenson (civil engineer), Robert Stevenson on the Bell Rock (also known as Inchca ...
(1807–1810). The new harbour had to have greater depth to accommodate steam packets. Rock blasted from the sea bed, within the harbour area and further south in what became known as the Quarry Hole at Meetinghouse Point was used to form the outer slopes of the two piers; but the inner faces were built of limestone from the Moelfre quarries of Anglesea. This 'Anglesea marble' lends itself to the finest ashlar dressing and the new piers remain a triumph of stone carving. The flights of steps display special skill in the deep diagonal binding of each solid step, providing a typically robust engineer's response to the wear of seaboots and waves alike. The harbour consists of two independent piers running north westwards out to sea; parallel nearer the shore, they converge at the outer ends to form a harbour mouth 150 feet (46m) wide. At low tide the water in the harbour is fifteen feet deep.


Bell Rock Lighthouse and Holyhead Mail Pier Lighthouse

The Bell Rock Lighthouse, near the entrance to the Firths of
Forth Forth or FORTH may refer to: Arts and entertainment * ''forth'' magazine, an Internet magazine * ''Forth'' (album), by The Verve, 2008 * ''Forth'', a 2011 album by Proto-Kaw * Radio Forth, a group of independent local radio stations in Scotl ...
and Tay, was built during 1807 and 1810. Rennie was, by some, credited with the design and execution, but there seems little doubt that he was only nominally responsible for the great undertaking. Robert Stevenson, surveyor to the Commissioners of Northern Lights, drew the original plans and, at his suggestion, the commissioners called Rennie to assist with obtaining parliamentary approval for the project, giving him the title of chief engineer (for which however he was only paid £400). Stevenson did not accept many of the modifications proposed by Rennie, but the two men remained on friendly terms. Rennie visited the lighthouse twice while it was being built. When Stevenson died in 1850, the Commissioners put on record in their minutes that to him was 'due the honour of conceiving and executing the Bell Rock lighthouse'. However, Rennie's son, Sir John Rennie, claimed in a long exchange of letters with
Alan Stevenson Alan Stevenson FRSE MInstCE (28 April 1807 – 23 December 1865) was a Scottish civil engineer, known for designing and building lighthouses in and around Scotland. Life Alan Stevenson was born in Edinburgh on 28 April 1807, the eldest son ...
in 1849 that the advice which Rennie gave Stevenson entitled him to rank the building as one which he "designed and constructed". The Holyhead Mail Pier Light is a conical white house which was built by Rennie in 1821. The lighthouse is of national significance as one of Rennie's surviving works. Of particular importance, in a Welsh context, is the early date of the lighthouse lantern, which was originally lit by gas. Before the conversion to electricity a gas works was located on the island to power the lighthouse, the piers and even part of Holyhead itself. The works were constructed at a cost of £130,000, an astronomical sum at the time. The tower survives intact and has beautifully curving gallery railings, similar to those at Bardsey Lighthouse. It is no longer in use, although it is used as a navigation reference for sailors. The
Howth Harbour Lighthouse The Harbour lighthouse in Howth is a historic aid to navigation situated on the East pier of the harbour. It was built in the early 19th century to help guide shipping into the newly constructed harbour, which acted as the terminus for the Packet ...
is a matching tower in
Howth Howth ( ; ; ) is a peninsular village and outer suburb of Dublin, Republic of Ireland, Ireland. The district as a whole occupies the greater part of the peninsula of Howth Head, which forms the northern boundary of Dublin Bay, and includes the ...
, Ireland, also designed by Rennie, for the other terminal of the Irish packet steamer.


Plymouth breakwater

Of all Rennie's works, that which appeals most strongly to the imagination is perhaps the
breakwater Breakwater may refer to: * Breakwater (structure), a structure for protecting a beach or harbour Places * Breakwater, Victoria, a suburb of Geelong, Victoria, Australia * Breakwater Island, Antarctica * Breakwater Islands, Nunavut, Canada * ...
at
Plymouth Sound Plymouth Sound, or locally just The Sound, is a deep inlet or sound in the English Channel near Plymouth in England. Description Its southwest and southeast corners are Penlee Point in Cornwall and Wembury Point in Devon, a distance of abo ...
, consisting of a wall a mile in length across the Sound, in about of water, and containing 3,670,444 tons of rough stone, besides of masonry on the surface. It was constructed to provide safe passage for naval vessels entering the river Tamar ( Hamoaze) at Devonport. This colossal work was first proposed in a report by Rennie, dated 22 April 1806; an order in council authorising its commencement was issued on 22 June 1811, and the first stone was deposited on 12 August following. The work was completed by his son, Sir John Rennie, and by
Joseph Whidbey Joseph Whidbey Fellow of the Royal Society, FRS (1757 – 9 October 1833) was a member of the Royal Navy who served on the Vancouver Expedition 1791–95, and later achieved renown as a naval engineer. He is notable for having been the first Eu ...
.


Technical innovator

Rennie was a man of unbounded resource and originality. During the improvement of Ramsgate harbour he made use of the diving-bell, which he greatly improved. He is generally credited with the invention of a form of steam-dredging machine with a chain of buckets, but in this he seems to have been anticipated by Sir
Samuel Bentham Brigadier General Sir Samuel Bentham (11 January 1757 – 31 May 1831) was an England, English mechanical engineering, mechanical engineer and naval architect credited with numerous innovations, particularly related to naval architecture, incl ...
. He was certainly the first to use it on an extensive scale, which he did during the construction of the Humber Dock, Hull (1803–09), when he devised a steam dredger to overcome the difficulties of that particular work, and apparently without any knowledge of Bentham's invention. Another expedient was the use of hollow walls, which was suggested by the necessity of providing an extensive bearing surface for the foundations of a wall in loose ground. Walls built upon this plan were largely used by Rennie.


Distinguishing characteristics

The distinguishing characteristics of Rennie's work were firmness and solidity, and it has stood the test of time. He was most conscientious in the preparation of his reports and estimates, and he never entered upon an undertaking without making himself fully acquainted with the local surroundings. He was devoted to his profession, and, though he was a man of strong frame and capable of great endurance, his incessant labours shortened his life. He was elected
Fellow of the Royal Society of Edinburgh Fellowship of the Royal Society of Edinburgh (FRSE) is an award granted to individuals that the Royal Society of Edinburgh, Scotland's national academy of science and Literature, letters, judged to be "eminently distinguished in their subject". ...
on 28 January 1788,
Fellow of the Royal Society Fellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted by the Fellows of the Royal Society of London to individuals who have made a "substantial contribution to the improvement of natural science, natural knowledge, incl ...
on 29 March 1798, and in 1815 he served as a Manager of the newly built
London Institution The London Institution was an educational institution founded in London in 1806 (not to be confused with the British Institution for Promoting the Fine Arts in the United Kingdom founded the previous year, with which it shared some founders). It ...
.


Family and death

In 1790 he married Martha Ann Mackintosh (d.1806), daughter of E. Mackintosh, and by her had seven children, two of whom,
George George may refer to: Names * George (given name) * George (surname) People * George (singer), American-Canadian singer George Nozuka, known by the mononym George * George Papagheorghe, also known as Jorge / GEØRGE * George, stage name of Gior ...
and
John John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second E ...
, became notable engineers. His daughter Anna married the architect Charles Cockerell. He died, after a short illness, at his house in Stamford Street, London, on 4 October 1821, and was buried in the crypt at
St. Paul's Cathedral St Paul's Cathedral, formally the Cathedral Church of St Paul the Apostle, is an Anglican cathedral in London, England, the seat of the Bishop of London. The cathedral serves as the mother church of the Diocese of London in the Church of Engl ...
.


Honours

* In 1862 a small parcel of the land south of
Blackfriars Bridge Blackfriars Bridge is a road and foot traffic bridge over the River Thames in London, between Waterloo Bridge and Blackfriars Railway Bridge, carrying the A201 road. The north end is in the City of London near the Inns of Court and Temple C ...
was designated as an open space to memorialise John Rennie by the
City of London Corporation The City of London Corporation, officially and legally the Mayor and Commonalty and Citizens of the City of London, is the local authority of the City of London, the historic centre of London and the location of much of the United Kingdom's f ...
. *In 2014 he was inducted into the
Scottish Engineering Hall of Fame The Scottish Engineering Hall of Fame honours "those engineers from, or closely associated with, Scotland who have achieved, or deserve to achieve, greatness", as selected by an independent panel representing Scottish engineering institutions, aca ...
. *The Ruislip Lido Railway, based at
Ruislip Lido Ruislip Lido ( ) is a reservoir and artificial beach in Ruislip, within the London Borough of Hillingdon, England, situated between Ruislip Common, Ruislip Woods (a Site of Special Scientific Interest), and Poor's Field. Originally created as a ...
(one of the dams John Rennie built), named one of its locomotives after him. The Bo-Bo type diesel 'John Rennie' was built in 2004 and is one of the main engines of the line. *More recently,
Lancaster Royal Grammar School Lancaster Royal Grammar School (LRGS) is an 11–18 boys grammar school in Lancaster, England, Lancaster, Lancashire, England. Old students belong to The Old Lancastrians. The school's sixth form opened to girls in 2019. LRGS is also in the Unit ...
Boat Club named one of their boats after him as he built the aqueduct over the river on which they row.


List of projects

* Lune Aqueduct (1794–97) *
Dundas Aqueduct Dundas Aqueduct () is an aqueduct in England which carries the Kennet and Avon Canal over the River Avon (the Somerset / Wiltshire border) and the Wessex Main Line railway. The aqueduct is near Monkton Combe, Somerset, and is about south-east ...
(1797) * Kelso Bridge, of five arches (1800–1804) *
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
bridge, a cast iron arch (1800) *
London Docks The London Docks were one of several sets of docks in the historic Port of London. They were constructed in Wapping, downstream from the City of London between 1799 and 1815, at a cost exceeding £5½ million. Traditionally ships had d ...
(1800–05) *
East India Docks The East India Docks were a group of docks in Blackwall in east London, north-east of the Isle of Dogs. Today only the entrance basin and listed perimeter wall remain visible. History Early history Following the successful creation of the ...
joint project with Ralph Walker (1803–06) * Humber Dock, Hull, 1803–9, cost £230,000 *
Greenock Greenock (; ; , ) is a town in Inverclyde, Scotland, located in the west central Lowlands of Scotland. The town is the administrative centre of Inverclyde Council. It is a former burgh within the historic county of Renfrewshire, and forms ...
Docks (1806) *
Musselburgh Musselburgh (; ; ) is the largest settlement in East Lothian, Scotland, on the coast of the Firth of Forth, east of Edinburgh city centre. It had a population of as of . History The name Musselburgh is Old English language, Old English in ...
bridge (1806–1808) *
West India Docks The West India Docks are a series of three docks, quaysides, and warehouses built to import goods from, and export goods and occasionally passengers to, the British West Indies. Located on the Isle of Dogs in London, the first dock opened in 18 ...
(consultant to
William Jessop William Jessop (23 January 1745 – 18 November 1814) was an English civil engineer, best known for his work on canals, harbours and early railways in the late 18th and early 19th centuries. Early life Jessop was born in Devonport, Devon, the ...
) extension to docks (1809–1821) *
Liverpool Liverpool is a port City status in the United Kingdom, city and metropolitan borough in Merseyside, England. It is situated on the eastern side of the River Mersey, Mersey Estuary, near the Irish Sea, north-west of London. With a population ...
Docks, two new docks including Prince's, estimated cost £929,878 (1809) *
Waterloo Bridge Waterloo Bridge () is a road and foot traffic bridge crossing the River Thames in London, between Blackfriars Bridge and Hungerford Bridge and Golden Jubilee Bridges. Its name commemorates the victory of the British, Dutch and Prussians at the ...
(old), granite of nine arches each 120 feet wide (1810–17) cost £1,050,000 *
New Galloway New Galloway () is a town in the historical county of Kirkcudbrightshire in Dumfries and Galloway. It lies on the west side of the valley of the Water of Ken, north of the end of Loch Ken. Before the local government reform of 1975, it was the s ...
Ken Bridge, of granite (1811–21) spans the River Ken. *Cree Bridge at
Newton Stewart Newton Stewart (Scottish Gaelic language, Gd: ''Baile Ùr nan Stiùbhartach'') is a former burgh town in the historical county of Wigtownshire in Dumfries and Galloway, southwest Scotland. The town is on the River Cree with most of the town to ...
(1812–14) *
Old Wye Bridge, Chepstow The Old Wye Bridge or ''Town Bridge'' at Chepstow, also known historically as Chepstow Bridge, crosses the River Wye between Monmouthshire in Wales and Gloucestershire in England, close to Chepstow Castle. Although there had been earlier wooden ...
cast iron bridge (design 1812), redesigned and built in 1816 by
John Urpeth Rastrick John Urpeth Rastrick (26 January 1780 – 1 November 1856) was one of the first English steam locomotive builders. In partnership with James Foster, he formed Foster, Rastrick and Company, the locomotive construction company that built the '' ...
* Plymouth Breakwater (1812–1841) completed by his son *
Southwark Bridge Southwark Bridge ( ) is an arch bridge in London, for traffic linking the district of Southwark and the City of London, City across the River Thames. Besides when others are closed for temporary repairs, it has the least traffic of the List of ...
(old) of three cast iron arches (1814) replaced 1920 * Dunleary Asylum Harbour – later Kingstown Harbour- Later Dún Laoghaire Harbour. 1816–1842. Completed by his son. Cost £690,717 against the original estimate of £801,059. *
Donaghadee Donaghadee ( , ) is a small town in County Down, Northern Ireland. It lies on the northeast coast of the Ards Peninsula, about east of Belfast and about six miles (10 km) south east of Bangor, County Down, Bangor. It is in the Civil paris ...
&
Portpatrick Portpatrick is a village and civil parishes in Scotland, civil parish in the historical county of Wigtownshire, Dumfries and Galloway, Scotland. It is located on the west coast of the Rhins of Galloway. The parish is about in length and in br ...
Harbours (1819) estimated cost £145,000 * Leeds Bridge cast iron designed (1820), built after his death by the resident engineer G. Leather *
Dublin Dublin is the capital and largest city of Republic of Ireland, Ireland. Situated on Dublin Bay at the mouth of the River Liffey, it is in the Provinces of Ireland, province of Leinster, and is bordered on the south by the Dublin Mountains, pa ...
Docks, 'Stack A' bonded warehouse; introduces lightning conductors, gas works and gas lighting (1820) *
London Bridge The name "London Bridge" refers to several historic crossings that have spanned the River Thames between the City of London and Southwark in central London since Roman Britain, Roman times. The current crossing, which opened to traffic in 197 ...
(old), designed 1820, built after his death by his son (1824–31) moved to Lake Havasu City in the USA *
Royal Observatory, Cape of Good Hope The Royal Observatory, Cape of Good Hope, is a former scientific institution in South Africa. Founded by the British Board of Longitude in 1820, its main building is now the headquarters building of the South African Astronomical Observatory. ...
Main Building, completed posthumously in 1828 * Blackwall Dock * Ruislip Reservoir, Grand Union Canal * Deeping Fen Drainage and pumping engines at
Pode Hole __NOTOC__ Pode Hole is a village in South Holland, Lincolnshire, England. It is from Spalding and 10 miles from Bourne. The village lies at the confluence of several drainage channels, where two pumping stations discharge water into Vernatt' ...
(incomplete at his death) *
Caen Hill Locks Caen Hill Locks () are a flight of 29 locks on the Kennet and Avon Canal, between Rowde and Devizes in Wiltshire, England. Of the 107 locks on the canal, those at Caen Hill are numbered 22 to 50, and they are near the canal highpoint at Ca ...
, a flight of locks on the
Kennet and Avon Canal The Kennet and Avon Canal is a waterway in southern England with an overall length of , made up of two lengths of Navigability, navigable river linked by a canal. The name is used to refer to the entire length of the navigation rather than sol ...
, between Rowde and
Devizes Devizes () is a market town and civil parish in Wiltshire, England. It developed around Devizes Castle, an 11th-century Norman architecture, Norman castle, and received a charter in 1141. The castle was besieged during the Anarchy, a 12th-cent ...
in
Wiltshire Wiltshire (; abbreviated to Wilts) is a ceremonial county in South West England. It borders Gloucestershire to the north, Oxfordshire to the north-east, Berkshire to the east, Hampshire to the south-east, Dorset to the south, and Somerset to ...
, England, comprising 29 locks.


See also

*
Canals of the United Kingdom The canals of the United Kingdom are a major part of the network of inland waterways in the United Kingdom. They have a History of the British canal system, varied history, from use for irrigation and transport, through becoming the focus of the ...
*
History of the British canal system The canal network of the United Kingdom of Great Britain and Ireland, United Kingdom played a vital role in the Industrial Revolution. The UK was the first country to develop a nationwide canal network which, at its peak, expanded to nearly i ...


References


Citations


Sources

* * *


External links


BBC brief biography of John Rennie
* {{DEFAULTSORT:Rennie, John 1761 births 1821 deaths People from East Linton Alumni of the University of Edinburgh British bridge engineers British canal engineers Fellows of the Royal Society of Edinburgh Fellows of the Royal Society Kennet and Avon Canal Burials at St Paul's Cathedral Millwrights Scottish civil engineers Scottish inventors 18th-century Scottish businesspeople 19th-century Scottish businesspeople Scottish company founders Scottish Engineering Hall of Fame inductees 18th-century Scottish engineers 19th-century Scottish engineers