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Hartland Point Lighthouse
Hartland Point Lighthouse is a Grade II listed building at Hartland Point, Devon, England. The point marks the western limit (on the English side) of the Bristol Channel with the Atlantic Ocean continuing to the west. Trinity House, the lighthouse authority for England and Wales, have a lighthouse on the tip of the peninsula. History Designed by Sir James Douglass, construction began in November 1873 by contractor Mr Yerward of Wales under the supervision of resident engineer Henry Norris, Douglass and Norris having completed Souter Lighthouse in 1871. The tower is tall with the lamp being above mean sea level. It was blessed by Frederick Temple, Bishop of Exeter, who later became Archbishop of Canterbury, and the light was lit for the first time by Lady Stucley of Hartland Abbey during the opening ceremony on 1 July 1874. The optic, a first-order rotating catadioptric array designed by James Chance, had been installed earlier that year. It flashed alternately red and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hartland Point Lighthouse (6889979228)
Hartland Point Lighthouse is a Grade II listed building at Hartland Point, Devon, England. The point marks the western limit (on the English side) of the Bristol Channel with the Atlantic Ocean continuing to the west. Trinity House, the lighthouse authority for England and Wales, have a lighthouse on the tip of the peninsula. History Designed by Sir James Douglass, construction began in November 1873 by contractor Mr Yerward of Wales under the supervision of resident engineer Henry Norris, Douglass and Norris having completed Souter Lighthouse in 1871. The tower is tall with the lamp being above mean sea level. It was blessed by Frederick Temple, Bishop of Exeter, who later became Archbishop of Canterbury, and the light was lit for the first time by Lady Stucley of Hartland Abbey during the opening ceremony on 1 July 1874. The optic, a first-order rotating catadioptric array designed by James Chance, had been installed earlier that year. It flashed alternately red and w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hartland Point
Hartland Point is a high rocky outcrop of land on the north-western tip of the Devon coast in England. It is three miles (5 km) north-west of the village of Hartland. The point marks the western limit (on the English side) of the Bristol Channel with the Atlantic Ocean continuing to the west. This location was known to the Romans as the "promontory of Hercules". Lighthouse Trinity House, the lighthouse authority for England and Wales, has a lighthouse on the tip of the peninsula. The Hartland Point Lighthouse was built in 1874 under the direction of Sir James Douglass. The Grade II-listed tower is tall with the lamp being above mean sea level. The light could be seen up to away from the coast. It was blessed by Frederick Temple, Bishop of Exeter, who later became Archbishop of Canterbury. The tower was automated in 1984 and is now controlled from Trinity House Operations Centre at Harwich in Essex. Prior to automation, the lighthouse was built with accommodation for f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hartland Point Lighthouse
Hartland Point Lighthouse is a Grade II listed building at Hartland Point, Devon, England. The point marks the western limit (on the English side) of the Bristol Channel with the Atlantic Ocean continuing to the west. Trinity House, the lighthouse authority for England and Wales, have a lighthouse on the tip of the peninsula. History Designed by Sir James Douglass, construction began in November 1873 by contractor Mr Yerward of Wales under the supervision of resident engineer Henry Norris, Douglass and Norris having completed Souter Lighthouse in 1871. The tower is tall with the lamp being above mean sea level. It was blessed by Frederick Temple, Bishop of Exeter, who later became Archbishop of Canterbury, and the light was lit for the first time by Lady Stucley of Hartland Abbey during the opening ceremony on 1 July 1874. The optic, a first-order rotating catadioptric array designed by James Chance, had been installed earlier that year. It flashed alternately red and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diaphone
The diaphone is a noisemaking device best known for its use as a foghorn: It can produce deep, powerful tones, able to carry a long distance. Although they have fallen out of favor, diaphones were also used at some fire stations and in other situations where a loud, audible signal was required. History The diaphone horn was based directly on the organ stop of the same name invented by Robert Hope-Jones, creator of the Wurlitzer organ. Hope-Jones' design was based on a piston that was closed only at its bottom end and had slots, perpendicular to its axis, cut through its sides; the slotted piston moved within a similarly slotted cylinder. Outside of the cylinder was a reservoir of high-pressure air. Initially, high-pressure air would be admitted behind the piston, pushing it forward. When the slots of the piston aligned with those of the cylinder, air passed into the piston, making a sound and pushing the piston back to its starting position, whence the cycle would repeat. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acetylene Lamp
Acetylene (systematic name: ethyne) is the chemical compound with the formula and structure . It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.Compressed Gas Association (1995Material Safety and Data Sheet – Acetylene As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the same straight line, with CCH bond angles of 180°. Discovery Acetylene was discovered in 1836 by Edmund Davy, who identified it as a "new carburet of hydrogen". It was an accidental discovery while attempting to isolate potassium metal. By heating potassium carbonate with carbon at very high temperatures, he produced a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Automatic Lamp Changer
An automatic lamp changer (or lampchanger) is a device used to ensure that a navigational light such as a marine lighthouse or aero beacon stays lit even if a bulb burns out. Numerous types exist. The common design elements are an array of two or more lamps (or bulbs), installed on a mounting which can rotate to various positions. Each position brings a different lamp into the focal point of an optical assembly. Since signal and navigational lights use sophisticated optics to focus the beam, lampchangers are designed to position the new bulb at the focal point with high precision. The device automatically detects when the currently active lamp has ceased to function and moves the next lamp into place. History The automatic lampchanger was invented by Charles Wallace and patented in 1928. This original model held two headlight lamps from a Model T automobile. The United States Lighthouse Service The United States Lighthouse Service, also known as the Bureau of Lighthouses, was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Filament Lamp
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated until it glows. The filament is enclosed in a glass bulb with a vacuum or inert gas to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embedded in the glass. A bulb socket provides mechanical support and electrical connections. Incandescent bulbs are manufactured in a wide range of sizes, light output, and voltage ratings, from 1.5 volts to about 300 volts. They require no external regulating equipment, have low manufacturing costs, and work equally well on either alternating current or direct current. As a result, the incandescent bulb became widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, and flashlights, and for decorative and advertising lighting. Incandescent bulbs are much less efficient than other types of electric lighting, converting less ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chance Brothers
Chance Brothers and Company was a glassworks originally based in Spon Lane, Smethwick, West Midlands (formerly in Staffordshire), in England. It was a leading glass manufacturer and a pioneer of British glassmaking technology. The Chance family originated in Bromsgrove in Worcestershire as farmers and craftsmen, before setting up business in Smethwick in 1822. Situated between Birmingham and the Black Country in the agglomeration of the Midlands industrial heartland, they took advantage of the skilled workers, canals and many advances that were taking place in the industrial West Midlands at the time. Throughout its almost two centuries of history many changes affected the company which, now privatised, continues to function as Chance Glass Limited, a specialised industrial glass manufacturer in Malvern, Worcestershire at one of its small subsidiary factories. The social and economic impact of the company on the region is the subject of a project sponsored by the Heritage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Characteristic
A light characteristic is all of the properties that make a particular navigational light identifiable. Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. Different lights use different colours, frequencies and light patterns, so mariners can identify which light they are seeing. Abbreviations While light characteristics can be described in prose, e.g. "Flashing white every three seconds", lists of lights and navigation chart annotations use abbreviations. The abbreviation notation is slightly different from one light list to another, with dots added or removed, but it usually follows a pattern similar to the following (see the chart to the right for examples). * An abbreviation of the type of light, e.g. "Fl." for flashing, "F." for fixed. * The color of the light, e.g. "W" for white, "G" for green, "R" for red, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caloric Engine
A hot air engine (historically called an air engine or caloric engine) is any heat engine that uses the expansion and contraction of air under the influence of a temperature change to convert thermal energy into mechanical work. These engines may be based on a number of thermodynamic cycles encompassing both open cycle devices such as those of Sir George Cayley and John Ericsson and the closed cycle engine of Robert Stirling. Hot air engines are distinct from the better known internal combustion based engine and steam engine. In a typical implementation, air is repeatedly heated and cooled in a cylinder and the resulting expansion and contraction are used to move a piston and produce useful mechanical work. Definition The term "hot air engine" specifically excludes any engine performing a thermodynamic cycle in which the working fluid undergoes a phase transition, such as the Rankine cycle. Also excluded are conventional internal combustion engines, in which heat is added t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siren (alarm)
A siren is a loud noise-making device. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. There are two general types: mechanical and electronic. Many fire sirens (used for calling the volunteer fire fighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either mounted on the roof of a fire station or on a pole next to the fire station. Fire sirens can also be mounted on or near government buildings, on tall structures such as water towers, as well as in systems where several sirens are distributed around a town for better sound coverage. Most fire sirens are single tone and mechanically driven by electric motors with a rotor attached to the shaft. Some newer sirens are electronically driven speakers. Fire sirens are often called "fire whistles", "fire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reed Pipe
A reed pipe (also referred to as a ''lingual'' pipe) is an organ pipe that is sounded by a vibrating brass strip known as a ''reed''. Air under pressure (referred to as ''wind'') is directed towards the reed, which vibrates at a specific pitch. This is in contrast to flue pipes, which contain no moving parts and produce sound solely through the vibration of air molecules. Reed pipes are common components of pipe organs. Stop Reed pipes include all stops of the "Reed" class, and some stops from the "Hybrid" class. The reed stops of an organ are collectively called the "reed-work". Construction A reed pipe comprises a metal ''tongue'' (the reed) which rests against a ''shallot'', in which is carved a tunnel. The reed and shallot are held in place by a wooden ''wedge''. This assembly protrudes from the underside of the ''block'' and hangs down into the ''boot''. A ''tuning wire'' is inserted through the boot and is bent to hold the reed against the shallot. The wire is moved up ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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