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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
scratch-brush, dried, and finally polished with whitening. This applies to tinning cast-iron, wrought-iron, steel, copper, brass, lead, and zinc. Apparatus for coating metal plates with tin. In Butterworth's apparatus (Fig. 6465), the sheet of metal to be tinned is drawn through the bath contained in the meltingpan B, being fed down the guide-plate g and drawn forward by the rollers b b′ a a. A curved apron b 2 supports the sheet while passing through the bath. The following is M. Heeren's process for giving iron wire the appearance of silver by a thin film of tin: the iron wire is first placed in hydrochloric acid, in which is suspended a piece of zinc. It is afterward placed in contact with a strip of zinc in a bath of two parts tartaric acid dissolved in 100 parts of water, to which are added three parts of tin salt and three parts of soda. The wire should remain about two hours in this bath, and then be removed, and made bright by polishing, or drawing through a poli