2237. Cement for Chemical Glasses

2237.    Cement for Chemical Glasses. Mix equal parts of wheat flour, finely-powdered Venice glass, pulverized chalk, and a small quantity of brick-dust, finely ground; these ingredients, with a little scraped lint, are to be mixed and ground up with the white of eggs; it must then be spread upon pieces of fine linen cloth, and applied to the crack of the glasses, and allowed to get thoroughly dry before the glasses are put to the fire.

2238. Hermetical Sealing for Bottles

2238.   Hermetical Sealing for Bottles. Gelatine mixed with glycerine yields a compound, liquid when hot, but becoming solid by cooling, at the same time retaining much elasticity. Bottles may be hermetically sealed by dipping their necks into the liquid mixture, and repeating the operation until the cap attains any thickness required.

2239. Cement to Seal Bottles Containing Volatile Liquids

2239.    Cement to Seal Bottles Containing Volatile Liquids. Chemists and others know well the difficulty of keeping volatile liquids. Bottles of ether, for example, are shipped for India, and when they arrive are found to be more than half empty. The remedy with exporters is a luting of melted sulphur, which is difficult to apply and hard to remove. A new cement, easily prepared and applied, and which is said to prevent the escape of the most volatile liquids, is composed of very finely ground litharge and concentrated glycerine, and is merely painted around the cork or stopper. It quickly dries and becomes extremely hard, but can be easily scraped off with a knife when it is necessary to open the bottle.

2240. Cement for Sealing Corks in Bottles

2240.    Cement for Sealing Corks in Bottles. Take an equal quantity of resin and bees' wax, melt them together, then put in an almost equal bulk of finely-powdered red chalk, add a small quantity of neatsfoot oil, let the whole boil 1 minute, then take it from the fire and stir it well; if too thick, add a little more oil.

2241. Cement for Sealing the Corks in Bottles

2241.    Cement for Sealing the Corks in Bottles. Melt together 1/4 pound sealing-wax, the same quantity of resin, and 2 ounces bees' wax. When it froths stir it with a tallow candle. As soon as it melts dip the mouths of the corked bottles in it.

2242. Painters' Putty

2242.    Painters' Putty. Putty is made of common whitening, pounded very fine, and mixed with linseed oil till it becomes about the thickness of dough.

2243. Quick Hardening Putty

2243.      Quick Hardening Putty. A putty of starch and chloride of zinc hardens quickly, and lasts for months, as a stopper of holes in metals.

2244. Cement to Stop Flaws or Cracks in Wood of any Color

2244.      Cement to Stop Flaws or Cracks in Wood of any Color. Put any quantity of fine sawdust, of the same wood the work is made with, into an earthen pan, and pour boiling water on it, stir it well, and let it remain for a week or ten days, occasionally stirring it; then boil it for some time, and it will be of the consistence of pulp or paste; put it into a coarse cloth, and squeeze all the moisture from it. Keep for use, and, when wanted, mix a sufficient quantity of thin glue to make it into a paste; rub it well into the cracks, or fill up the holes in the work with it. When quite hard and dry, clean the work off, and, if carefully done, the imperfection will be scarcely discernible.