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Aluminum disc. In the field of audio recording, an aluminum disc ( aluminium in the UK and elsewhere) is a phonograph (gramophone in the UK) record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings. Although sometimes used for making amateur studio or home recordings or in coin-operated "record-your ...
A coin with one type of metal in the center with an outer ring of a different metal. Examples are the 1 and 2 Euro coins and the Canadian "toonie" two-dollar coin. blank. Also called a planchet or flan. 1. A prepared disk of metal on which the design for a coin will be stamped. [1] 2. The un-struck or flat side of a uniface coin or medal. brass
Chemically, aluminium is a post-transition metal in the boron group; as is common for the group, aluminium forms compounds primarily in the +3 oxidation state. The aluminium cation Al 3+ is small and highly charged; as such, it has more polarizing power, and bonds formed by aluminium have a more covalent character.
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According to a 2021 article on The Spruce Crafts website, most blank coins are worth a few dollars if they are “clad,” meaning they feature multiple layers of metal such as copper and nickel.
An enamel sign is a sign made using vitreous enamel. These were commonly used for advertising and street signage in the period 1880 to 1950. Benjamin Baugh created the first purpose-built factory for making such signs in Selly Oak in 1889 — the Patent Enamel Company. [ 1] The technique of porcelain enamelling on cast iron was developed in ...
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