The practical metal-worker's assistant; With the application of the art of electro-metallurgy to manufacturing processes. Collected from original ... Leupold, Plumier, Napier, and others

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1864 Excerpt: ...and spread the alloy evenly through the joint; the work is then allowed to cool under pressure applied by the hammer handle, the blunt end of a tool, the tail-vice, or in any convenient manner. The stages of this practice are similar to those of the carpenter, who having brushed the glue over the two pieces of wood, rubs them together and fixes them with the hand screws until cold, as before adverted to. Small works are sometimes united by cleaning the respective surfaces, moistening them with sal-ammoniac water, or applying the dry powder or resin, then placing between the pieces a slip of tin-foil, previously cleaned with emory-paper, and pinching the whole between a pair of heated tongs to melt the foil; or, other similar modifications combining heat and pressure are used. Many workmen who are accustomed to the blowpipe, as jewelers, mathematical instrument makers, and others, apply the blowpipe with great success in soft-soldering; but as the methods are in other respects similar to those given, they do not require particular notice, except that in some cases there is no choice but to tie the works together with binding-wire as in hard-soldering; but the preference is always given to detached tinning and rubbing together. The modern gas-fitters are remarkably expert in joining tin and lead pipes with the blowpipe; they do not employ the method of the plumbers and pewterers, or the spigot and faucet joint surrounded by a bulb of solder, but they cut off thoends of the pipes with a saw, and file the surfaces to meet in butt joints, in mitres, or in T form joints as required. In confined situations they apply the heat from one side only with the blowpipe and rushes; they employ a richitin solder, with oil and resin mixed in equal parts as the flux; the wor...