Have two baths, one containing the molten tin, kept at a proper temperature, the other a saturated solution of zinc chloride. Immerse the coil of brass wire in a boiling solution of caustic potash, and remove it to a bobbin, having a fixed spindle and one movable end. Pass the wire by means of suitable hard wood or brass deeply-groovel pulleys, so that it shall pass through the zinc chloride bath into the molten tin, and after immersion cause it to pass between the grooves of two pulleys, revolving in contact with each other, so that the grooves form a hole equal in size to the tinned wire; these will squeeze off any superfluous metal that may be carried up from the bath; carry forward the end and attach to it a fresh bobbin, and wind off at a speed that must be regulated by experience. The wire must be raised sufficiently in temperature before it will take the tin, and it must be properly cooled again before it reaches the final bobbin, which can be effected by placing it at a proper distance from the tin bath.
(6) A solution of tin perchloride is first prepared by passing washed chlorine gas into concentrated aqueous solution of tin salt, and expelling the excess of chlorine by gently warming it, then diluting it with 8 to 10 times its volume of water, and filtering it if necessary. The article, well pickled in dilute sulphuric acid, polished with sand and a steel scratch-brush, and rinsed with water, is loosely wound with a zinc wire, and immersed for 10-15 minutes, at the ordinary temperature, in the dilute solution of tin perchloride. When tinned in this way, it is raised, brushed with a scratch-brush, dried, and finally polished with whiting. Cast iron, wrought iron, steel, copper, brass, lead, and zinc can be tinned by this method.
(d) Get some pure tin and melt in a ladle. Place a dish to hold about 6 in. of water on the ground. When tin is melted, hold ladle in a line with shoulder and pour gently into water, after which take out and put into a clean dish (copper is best), free from every kind of dirt and grease. Cover bottom of vessel with tin, - put wire on top (the wire must be thoroughly cleansed), cover with another layer of tin, fill with pure water, and sprinkle cream of tartar over. You must judge yourself as to quantity; too much will blacken your wire and tin, too little will not take on the tin. Place your dish on fire. When boiling allow it to remain so for 20 minutes; the dish should have a cover to it.
(e) 1 part potash bitartrate, 2 of alum, and 2 of common salt, in 10-12 water; add pure tin filings. Boil the article in the solution. This avoids the great heat of molten tin.