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HMG Heat And Waterproof Adhesive
HMG Heat and Waterproof Adhesive (also known as HMG or HMG adhesive) is a brand of cellulose nitrate adhesive manufactured by H Marcel Guest Ltd. It is one of the most popular cellulose nitrate adhesives used in conservation and restoration work, and is used on materials such as metal, wood, glass, and pottery. It is sometimes referred to as "the blue tube", in contrast to "the purple tube", the acrylic B72 Restoration Adhesive also manufactured by the company. Invention and use HMG was invented during World War II by the company's founder, Herbert Falder. Today it is broadly used, including by the British Museum and the York Archaeological Trust. In 1997, HMG was used to adhere pieces of the Anglo-Saxon Pioneer helmet, which was found broken into between 100 and 200 fragments. Particularly fragile areas had their cracks injected with a solution of HMG diluted 50% with acetone, to consolidate them and prevent them from collapsing; holes made while cleaning away corrosion w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pioneer Helmet
The Pioneer Helmet (also known as the Wollaston Helmet or Northamptonshire Helmet) is an Anglo-Saxon boar-crested helmet from the late seventh century found in Wollaston, Northamptonshire, United Kingdom. It was discovered during a March 1997 excavation before the land was to be mined for gravel and was part of the grave of a young man. Other objects in the grave, such as a hanging bowl and a pattern welded sword, suggest that it was the burial mound of a high-status warrior. The sparsely decorated nature of the helmet, a utilitarian iron fighting piece, belies its rarity. It is one of just six Anglo-Saxon helmets yet discovered, joined by finds from Benty Grange (1848), Sutton Hoo (1939), Coppergate (1982), Shorwell (2004) and Staffordshire (2009); its basic form is nearly identical to that of the richer Coppergate helmet found in York. Like these, the Pioneer Helmet is an example of the "crested helmets" that flourished in England and Scandinavia from the sixth throu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrocellulose
Nitrocellulose (also known as cellulose nitrate, flash paper, flash cotton, guncotton, pyroxylin and flash string, depending on form) is a highly flammable compound formed by nitrating cellulose through exposure to a mixture of nitric acid and sulfuric acid. One of its first major uses was as guncotton, a replacement for gunpowder as propellant in firearms. It was also used to replace gunpowder as a low-order explosive in mining and other applications. In the form of collodion it was also a critical component in an early photographic emulsion, the use of which revolutionized photography in the 1860s. Production The process uses a mixture of nitric acid and sulfuric acid to convert cellulose into nitrocellulose. The quality of the cellulose is important. Hemicellulose, lignin, pentosans, and mineral salts give inferior nitrocelluloses. In precise chemical terms, nitrocellulose is not a nitro compound, but a nitrate ester. The glucose repeat unit (anhydroglucose) within th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conservation-restoration Of Cultural Heritage
The conservation and restoration of cultural property focuses on protection and care of cultural property (tangible cultural heritage), including artworks, architecture, archaeology, and museum collections. Conservation activities include preventive conservation, examination, documentation, research, treatment, and education. This field is closely allied with conservation science, curators and registrars. Definition Conservation of cultural property involves protection and restoration using "any methods that prove effective in keeping that property in as close to its original condition as possible for as long as possible." Conservation of cultural heritage is often associated with art collections and museums and involves collection care and management through tracking, examination, documentation, exhibition, storage, preventive conservation, and restoration. The scope has widened from art conservation, involving protection and care of artwork and architecture, to conserva ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies of World War II, Allies and the Axis powers. World War II was a total war that directly involved more than 100 million Military personnel, personnel from more than 30 countries. The major participants in the war threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Air warfare of World War II, Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and deploying the Atomic bombings of Hiroshima and Nagasaki, only two nuclear weapons ever used in war. World War II was by far the List of wars by death toll, deadliest conflict in hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Museum
The British Museum is a public museum dedicated to human history, art and culture located in the Bloomsbury area of London. Its permanent collection of eight million works is among the largest and most comprehensive in existence. It documents the story of human culture from its beginnings to the present.Among the national museums in London, sculpture and decorative and applied art are in the Victoria and Albert Museum; the British Museum houses earlier art, non-Western art, prints and drawings. The National Gallery holds the national collection of Western European art to about 1900, while art of the 20th century on is at Tate Modern. Tate Britain holds British Art from 1500 onwards. Books, manuscripts and many works on paper are in the British Library. There are significant overlaps between the coverage of the various collections. The British Museum was the first public national museum to cover all fields of knowledge. The museum was established in 1753, largely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
York Archaeological Trust
The York Archaeological Trust for Excavation and Research Limited (YAT) is an educational charity, established in 1972 in the city of York, England. It carries out archaeological investigations, fieldwork, excavation and research in York, Yorkshire and throughout Britain and beyond. Its staff include specialists in archaeological excavation, historic building analysis and recording, artefact curation, conservation and research, archaeological computing, and illustration and design. Commercial operations YAT primarily provides archaeological services to fulfil planning conditions, serving clients from private individuals to local authorities and commercial developers, as a company operating within the commercial archaeology sector. In 2011, Trent and Peak Archaeology was taken over by YAT, allowing extension of their commercial archaeology operations to Nottingham. YAT also operated ''ArcHeritage'' providing archaeological services in Sheffield, and ''Northlight Heritage'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anglo-Saxons
The Anglo-Saxons were a cultural group who inhabited England in the Early Middle Ages. They traced their origins to settlers who came to Britain from mainland Europe in the 5th century. However, the ethnogenesis of the Anglo-Saxons happened within Britain, and the identity was not merely imported. Anglo-Saxon identity arose from interaction between incoming groups from several Germanic tribes, both amongst themselves, and with indigenous Britons. Many of the natives, over time, adopted Anglo-Saxon culture and language and were assimilated. The Anglo-Saxons established the concept, and the Kingdom, of England, and though the modern English language owes somewhat less than 26% of its words to their language, this includes the vast majority of words used in everyday speech. Historically, the Anglo-Saxon period denotes the period in Britain between about 450 and 1066, after their initial settlement and up until the Norman Conquest. Higham, Nicholas J., and Martin J. Ryan. ''The An ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acetone
Acetone (2-propanone or dimethyl ketone), is an organic compound with the formula . It is the simplest and smallest ketone (). It is a colorless, highly volatile and flammable liquid with a characteristic pungent odour. Acetone is miscible with water and serves as an important organic solvent in its own right, in industry, home, and laboratory. About 6.7 million tonnes were produced worldwide in 2010, mainly for use as a solvent and production of methyl methacrylate (and from that PMMA) as well as bisphenol A.Acetone World Petrochemicals report, January 2010Stylianos Sifniades, Alan B. Levy, "Acetone" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005. It is a common building block in |
Dexter And Sinister
''Dexter'' and ''sinister'' are terms used in heraldry to refer to specific locations in an escutcheon bearing a coat of arms, and to the other elements of an achievement. ''Dexter'' (Latin for 'right') indicates the right-hand side of the shield, as regarded by the bearer, i.e. the bearer's proper right, and to the left as seen by the viewer. ''Sinister'' (Latin for 'left') indicates the left-hand side as regarded by the bearer – the bearer's proper left, and to the right as seen by the viewer. In vexillology, the equivalent terms are ''hoist'' and '' fly''. Significance The dexter side is considered the side of greater honour, for example when impaling two arms. Thus, by tradition, a husband's arms occupy the dexter half of his shield, his wife's paternal arms the sinister half. The shield of a bishop shows the arms of his see in the dexter half, his personal arms in the sinister half. King Richard II adopted arms showing the attributed arms of Edward the Confessor in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nasal Helmet
The nasal helmet was a type of combat helmet characterised by the possession of a projecting bar covering the nose and thus protecting the centre of the face; it was of Western European origins and was used from the late 9th century to at least . Early forms The nasal helmet was characterised by the possession of a nose-guard, or "nasal", composed of a single strip of metal that extended down from the skull or browband over the nose to provide facial protection. The helmet appeared throughout Western Europe late in the 9th century, and became the predominant form of head protection, replacing previous types of helmet whose design was ultimately based on Late Roman types such as the ridge helmet and early helmets of spangenhelm construction. Early nasal helmets were universally conical in shape. The skull could be raised from a single sheet of iron or be of composite, segmented (spangenhelm) construction. The spangenhelm variety was, in general, the earlier method of constructio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flash Point
The flash point of a material is the "lowest liquid temperature at which, under certain standardized conditions, a liquid gives off vapours in a quantity such as to be capable of forming an ignitable vapour/air mixture". (EN 60079-10-1) The flash point is sometimes confused with the autoignition temperature, the temperature that causes spontaneous ignition. The fire point is the lowest temperature at which the vapors keep burning after the ignition source is removed. It is higher than the flash point, because at the flash point vapor may not be produced fast enough to sustain combustion. Neither flash point nor fire point depends directly on the ignition source temperature, but ignition source temperature is far higher than either the flash or fire point. Fuels The flash point is a descriptive characteristic that is used to distinguish between flammable fuels, such as petrol (also known as gasoline), and combustible fuels, such as diesel. It is also used to characterize t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adhesives
Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanical fastenings, or welding. These include the ability to bind different materials together, the more efficient distribution of stress across a joint, the cost-effectiveness of an easily mechanized process, and greater flexibility in design. Disadvantages of adhesive use include decreased stability at high temperatures, relative weakness in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing. Adhesives are typically organized by the method of adhesion followed by ''reactive'' or ''non-reactive'', a term which refers to whether the adhesive chemically reacts in order to harden. Alternatively, they can be organized eithe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
