cements, lamps defined in 1909 yearcements, lamps - Cements, Lamps;
cements, lamps - The cement commonly used for fastening the tops on petroleum lamps is plaster-of-Paris, which is porous, quickly penetrated by the petroleum, and soon destroyed. Another cement which has not this defect is made by boiling 3 parts of resin and 1 of caustic soda in 5 of water. This composition forms a soap, which, when mixed with half its weight of plaster-of-Paris, sets firmly in about ½ hour. It is said to be of great adhesive power, not permeable by petroleum, a low conductor of heat, and but superficially attacked by hot water. Zinc white, white lead or precipitated chalk may be used instead of the plaster, but when they are used the cement will be longer in hardening.
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