cold working pressure
31Vitreography — is a fine art printmaking technique that uses a 3/8 inch thick float glass matrix instead of the traditional matrices of metal, wood or stone. A print created using the technique is called a vitreograph. Unlike a monotype, in which ink is painted …
32zinc processing — Introduction preparation of the ore for use in various products. Zinc (Zn) is a metallic element of hexagonal close packed (hcp) crystal structure and a density of 7.13 grams per cubic centimetre. It has only moderate hardness and can …
33Three-drum boilers — Three drum boiler, casing removed …
34W. H. R. Rivers — Photograph of Rivers taken by Henry Maull Born 12 March 1864(1864 03 12) …
35Steam car — Stanley Steam Car (1912) White touring car (1909) …
36Extrusion — is a process used to create objects of a fixed cross sectional profile. A material is pushed or drawn through a die of the desired cross section. The two main advantages of this process over other manufacturing processes is its ability to create… …
37Brass — For other uses, see Brass (disambiguation). Brass die, along with zinc and copper samples. Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.[1] In …
38History of the steam engine — This article primarily deals with the history of the reciprocating type steam engine. The parallel development of turbine type engines is described in the steam turbine article. The history of the steam engine stretches back as far as the first… …
39Swaging — (  /ˈsweɪ …
40Glass — This article is about the material. For other uses, see Glass (disambiguation). Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia …
