556 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



water-bath until the ammoniacal smell has entirely disappear- 

 ed. More of the solution is then added, and the boiling con- 

 tinued until the shellac forms a coherent, sponge-like mass. 

 The carbonate of ammonia is then exj^elled by further boil- 

 ing, and the mass will readily dissolve by pouring boiling 

 water upon it. A kind of soap will be found floating upon 

 the surface, which may readily be removed by straining. 

 The solution si3read on paper, etc., dries rapidly, and leaves a 

 thin, lustrous, adherent film of shellac. 3 A, October 5, 1872, 

 282. ; 



EUBBER-GEAPHITE PAINT. 



A so-called rubber-graphite paint has recently been patent- 

 ed, said to be water-proof, and to present another advantage 

 in reducing the corrosive influence of exjDosure to the at- 

 mosphere, etc. It is a solution of pure India rubber in lin- 

 seed-oil, which is ground with graphite into a thick, elastic, 

 smoothly flowing paint. Compositions of which India rub- 

 ber forms a part possess in a very high degree the quality of 

 resisting the action of moisture and of corrosive gases. The 

 graphite is a pure form of carbon, and it is well known that 

 paints containing carbon last longer than other kinds, hold- 

 ing their body and color when other paints are totally de- 

 stroyed. Hence the combination may, as suggested, form 

 a paint of great durability and highly protective qualities. 

 Cream-color or drab paints can be obtained by this method. 

 IQ A, October, 1812, 538. 



UTILIZING WASTE KUBBER. 



By melting down the waste clippings, etc., of hard rubber, 

 and dissolving the mass, when cold, in benzole or spirits of 

 turpentine, an excellent varnish may be made, which dries 

 rapidly, adheres firmly to metals, and is well adapted for 

 electrical apparatus. 15 0, 1872, xix., 300. 



YAKNISH FOR BASKET-WARE. 



The following varnish for basket-work is said to dry rapid- 

 ly, to possess sufiicient elasticity, and to be applicable with 

 or without admixture of color: Heat 375 grains of good lin- 

 seed-oil on a sand-bath until it becomes stringy, and a drop 

 placed upon a cold, inclined surface does not run ; then add 



