To pulverize solder or block tin, melt the metal, but do not let it get any hotter than barely to liquefy it; pour it out into an old ticking apron, gather up the corners and rub or knead it briskly between the hands, until it is granulated.
To purify water in cisterns and casks when it has become impure and dirty, for each hogshead of water contained in the cistern or cask sprinkle into it a ta-blespoonful of pulverized alum, stirring the water at the same time. The impurities will be precipitated to the bottom in a few hours and the water will be found clean and clear.
Purple of Cassius is prepared by the dissolution of 30 86-100 grains of tin in boiling aqua regia, the solution being evaporated at a gentle heat until solid. Next comes its dissolution in distilled water, and after the addition of 30 86-100 grains of stannous chloride solution diluted with 10 quarts of water.
For a stove putty use Portland cement. It is not quite as permanent, perhaps, as a rust joint, but for inexperienced persons it is very valuable. It is often used in putting iron pipes together and works well. It is safer in green hands than lead, which has to be well caulked and may fail even when well put in, if exposed to extremes of temperature.
(2) A stove putty which is very good and cheap can be prepared as follows: To every pound of mineral brown, add one ounce of soapstone, and mix with boiled oil.
Queen's Metal is composed of:
To recover nickel from old solutions take ammonium-sulphate in warm water, which is to be constantly stirred into the old nickel-plating solution. After this has been done for a little while the separation of the granular precipitation of the double sulphate of nickel will commence. Continue the addition of the ammonium-sulphate until the liquid is colorless.
A refractory solder for enameled work is made of:
18 parts Silver, 74 parts Gold.
The application of rotten stone and oil will generally remove acid spots from steel. It will also remove rust, and bath brick will give the metal the desired polish. This brilliancy of steel may be retained indefinitely if, after final polishing, it be washed in hot suds and rinsed in clear, hot water.
To remove oil or grease from the teeth of a new file, rub chalk or charcoal on the teeth, and clean with a file card. Repeat the operation until the oil or grease is absorbed and removed.
For removing mineral oil or wax spots, which are very hard to eradicate, especially when they have penetrated deeply into the fibre, owing to ironing of the said bodies, aniline is recommended. This remedy is used in the following mixture: Aniline, 1 part; soap, 1 part; water, 19 parts.