Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Leave the article in the solution for a day or ,coninionly known ns sheet-tin, but, properly speak-ing, tinned iron-plate, is male by dipping the plate, previouslyscoured bright and pickled by immersion in dilute sulphuricacid, into a bath of molten tin covered with a mixture of oil androsin. Tinned iron uire is prepared in a similar way. SeeTin-pla
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Leave the article in the solution for a day or ,coninionly known ns sheet-tin, but, properly speak-ing, tinned iron-plate, is male by dipping the plate, previouslyscoured bright and pickled by immersion in dilute sulphuricacid, into a bath of molten tin covered with a mixture of oil androsin. Tinned iron uire is prepared in a similar way. SeeTin-plate. In process for cavering iron with zinc, the plates,having been hammered and scoured to detach scale, are im-mersed in a preparing b;ith, composed of equal parts of sal-ammoniac and muriate of zinc, from which they are transferredfco the metallic bath, which is composed of 202 parts mercury. Apparatus/or Tinning Sheet-Metal Roojing-Strips. to 1,292 parts zinc, by weight, with the addition of about 1pound sodium or potassium to each ton of the compound. Theaffinity of this alloy for iron being very strong, care must betaken to avoid too long immersion, which would dissolve theiron. Fig. 3819 is a machine for covering with a soft metal a stripof roofing-metal made up of several sections joined together. Theends of sheets or strips of metal are interlocked, and the con-nected sheets then passed between rollers to close the .=eanis,and then through abath of molten tin or other soft metal, whichcoats the surface and closes and covers the seams, so as to formcontinuous pieces of indefinite length without appreciable orpervious joints. In coating copper or brass vessels imth tin, they are firstpickled with sulphuric acid diluted with about three times itsbulk of water, then scrubbed with sand and wafer and washeddry. They are next sprinkled with dry powdered sal-ammoniacand slig
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