99 

 GOOD STRONG GLUE WATERPROOF. 



Alcohol, (spirit of wine) 1 pint; sandarac, 1 ounce; 

 mastic, 1 ounce; common white turpentine, 1 ounce; glue 

 and isinglass, sufficient; water, sufficient. Dissolve the two 

 resins sandarac and mastic in the spirit, and then add the 

 turpentine to the solution. Make some very strong glue, 

 and add to it a good pinch of isinglass. Now heat the alco- 

 holic varnish until the liquid begins to boil, and then very 

 slowly stir in the warm glue. The amount of the liquid 

 glue to be added is determined by noting the point at which, 

 after thorough mixture, a magma or a thin paste is formed 

 capable of being easily strained through cloth. When re- 

 quired for use, the strained mixture is to be warmed and 

 applied like ordinary glue to the articles to be united. A 

 strong junction is effected, which is not destroyed by cold 

 water, and only after a con paratively considerable time, by 

 hot water or ordinary saline solutions. British Journal of 

 Photography. 



ETHER GLUE. 



An excellent liquid glue is made by dissolving glue in 

 nitric ether. The ether will only dissolve a certain amount 

 of glue, consequently the solution cannot be made too thick. 

 The glue thus made is about the consistency of molasses, 

 and is doubly as tenacious as that made with hot water. If 

 a few bits of india rubber, cut into scraps the size of buck- 

 shot, be added, and the solution be allowed to stand a few 

 days, being stirred frequently, it will be all the better, and 

 will resist the dampness twice as well as glue made with 

 water. 



GLYCERIN CEMENT. 



A cement, said to be capable of use where resistence to 

 the action of both water and heat is required, is composed 



