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A tintype, also known as a melanotype or ferrotype, is a photograph made by creating a direct positive on a thin sheet of metal, colloquially called 'tin' (though not actually tin-coated), coated with a dark lacquer or enamel and used as the support for the photographic emulsion. It was introduced in 1853 by Adolphe Alexandre Martin in Paris. [1]
The Ohio History Connection operates dozens of state historic sites across Ohio. Its headquarters is the 250,000-square-foot (23,000 m 2) Ohio History Center in Columbus, Ohio, a Brutalist concrete structure. [14] [15] Extensive exhibits cover Ohio's history from the Ice Age to the present. The Center includes state archives and library spaces ...
A refractory metal is a metal that is very resistant to heat and wear. Which metals belong to this category varies; the most common definition includes niobium, molybdenum, tantalum, tungsten, and rhenium as well as their alloys. They all have melting points above 2000 °C, and a high hardness at room temperature. Several compounds such as ...
In the first state the background is plain; the landscape of state II was probably added some years later. In printmaking , a state is a different form of a print, caused by a deliberate and permanent change to a matrix such as a copper plate (for engravings etc.) or woodblock (for woodcut ).
Commercial website traces the history of one manufacturer of electrotyped art metal in the US from the 1880s through the 1930s. The firm was created by P. Mori and Sons, who manufactured objects with the brand name Galvano Bronze. Subsequent names included: Pompeian Bronze, Armor Bronze, Marion Bronze, Kathodion Bronze Works and LaFrance Bronze ...
The Ohio History Center is the headquarters of the Ohio History Connection, which also operates dozens of state historic sites across Ohio. [1] [2] Extensive exhibits cover Ohio's history from the Ice Age to the present. The Center includes state archives and library spaces, a gift shop, and administrative and educational facilities.
Metallurgy derives from the Ancient Greek μεταλλουργός, metallourgós, "worker in metal", from μέταλλον, métallon, "mine, metal" + ἔργον, érgon, "work" The word was originally an alchemist's term for the extraction of metals from minerals, the ending -urgy signifying a process, especially manufacturing: it was discussed in this sense in the 1797 Encyclopædia ...
One of the methods of archaeometallurgy is the study of modern metals and alloys to explain and understand the use of metals in the past. A study conducted by the department of Particle Physics and Astrophysics at Weizmann Institute of Science and the department of Archaeology at the University of Haifia analyzed the chemical composition and the mass of different denominations of Euro coinage.