How To Fasten Rubber To Wood And Metal

As rubber plates and rings are

nowadays used almost exclusively for making connections between steam

and other pipes and apparatus, much annoyance is often experienced by

the impossibility or imperfection of an air-tight connection. This is

obviated entirely by employing a cement which fastens alike well to the

rubber and to the metal or wood. Such cement is prepared by a solution

of Shellac in Ammonia. This is best made by soaking pulverized Gum

Shellac in ten times its weight of strong Ammonia, when a slimy mass is

obtained, which in three or four weeks will become liquid without the

use of hot water. This softens the rubber and becomes, after

volatilization of the Ammonia, hard and impermeable to gases and


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