Calamine brass slowly phased out as zinc smelting techniques were developed in Europe, which produced metallic zinc more suitable for brass production than calamine. However, the conversion away from calamine brass manufacture was slow; a British patent was awarded to William Champion in 1738, but the alloying of metallic zinc and copper to produce brass was not patented until 1781 (by James Emerson), and calamine brass mills persisted in South Wales until as late as 1858. The slow diffusion of this technology was probably the result of economic factors. Calamine brass Calamine brass is brass produced by a particular alloying technique using
The Big Ore other records. Victor had got no friends, embittered against him brigade, but the first bucket of ore carry exactly it. The Big Ore The Big Ore () is a 1964 drama film directed by Vasily Ordynsky and based on the novel by Georgi Vladimov. Viktor Pronin (Yevgeni Urbansky) returned from the army to the bride (Svetlana Zhgun), and she – the other. Then Victor went to "great" Kursk ore, where the work is in full swing – all live in anticipation of the first car of ore. To check Pronyakin, Brigadier (Vsevolod Sanaev) gives him beaten MAZ: mend – a