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Quick Hardening Putty

putty of starch and chloride of zinc hardens A quickly, and lasts for months, as a stopper of bisulphuret of carbon; or a mixture of 94 holes in metals. parts bisulphuret of carbon and 6 parts abso- 2244. Cement to Stop Flaws or lute alcohol; also in caoutchoucine. (See No. Cracks in Wood of any Color. Put any 2249.) These dissolve the gum rapidly in the 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. 2245. Cement for Cloth, Leather, or Belting. Take ale, 1 pint; best Russia isinglass, 2 ounces; put them into a common glue kettle and boil until the isinglass is discold, and leave it unaltered on evaporation; they have a disagreeable odor, but they leave the India rubber in better condition than most other solvents. Oil of turpentine, rendered pyrogenous by absorbing it with bricks of porous ware, and distilling it without water, and treating the product in the same way, is also used for this purpose. It is stated that the solution on evaporation does not leave the caoutchouc in a sticky state. Another method is to agitate oil of turpentine repeatedly with a mixture of equal weights of sulphuric acid and water; and afterwards expose it to the sun for some time. Benzole, rectified mineral or coal tar naphtha, and oil of turpentine reduce the gum slowly by long digestion and trituration, with heat, forming a glutinous jelly which dries slowly, and leaves the gum, solved; then add 4 ounces best glue, and dis- when dry, very much reduced in hardness and solve it with the other; then slowly add 1½ elasticity. The fats and fixed oils combine ounces boiled linseed oil, stirring all the time readily with India rubber by boiling, forming while adding and until well mixed. When a permanently glutinous paste. (See No. cold it will resemble India rubber. To use 2947.) India rubber is rendered more readily this, dissolve what is needed in a suitable soluble by first digesting it with a solution of quantity of ale to the consistence of thick carbonate of soda, or water of ammonia. gluc. It is applicable for leather, for harness, 2249. Caoutchoucine. Pure India rubbands for machinery, cloth belts for cracker ber, cut into small lumps, is thrown into a machines for bakers, &c., &c. If for leather, cast-iron still, connected with a well-cooled shave off as if for sewing, apply the cement with a brush while hot, laying a weight to keep cach joint firmly for 6 to 10 hours, or over night. worm tub, and heat is applied until the thermometer ranges about 600° Fahr., when nothing is left in the still but dirt and charcoal. The dark colored fetid oil which has distilled