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cements, glycerine


Значение термина cements, glycerine в knolik


cements, glycerine - Cements, Glycerine
cements, glycerine - Chemists and others know well the difficulty of keeping very volatile liquids. Bottles of ether for example, are shipped for India, and when they arrive are found to be more than half empty. The chemist sometimes puts a bottle of benzole or bisulphide of carbon on his shelves, and when he next requires it, he finds the bottle empty and dry. The usual remedy for this is a luting of melted sulphur, which is difficult to apply and hard to remove. Glycerine cement, however, is easily prepared and applied, and is said to prevent the escape of the most volatile liquids. It 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.
  1. The hardest cement is produced by triturating 50 grm. of litharge with 5 c.c. of glycerine. If more glycerine is used, the mass hardens much more slowly and imperfectly
  2. A cement which rapidly hardens and still has considerable firmness is obtained by adding 2 volumes of water to 5 of glycerine (sp. gr. 1.240) 6 c.c. of this liquid are incorporated with 50 grm. of litharge.
  3. Pollack's. Litharge and red lead, equal parts: mix thoroughly, and make into a paste with concentrated glycerine to the consistence of soft putty. This cement takes some time to dry, but it turns almost as hard as stone, and resists moisture and heat very well. Pollack used it to fasten the different portions of a fly-wheel with great success; while when placed between stones and once hardened, it is easier to break the stone than the joint.

Рядом со словом cements, glycerine в knolik


cements, damp and moisture resisting glueВ начало
буква ""
буквосочетание ""		cements, elastic glue

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