differeut parts. This cylinder is fitted witha metallic piston, and the shape of the cylinder enables thistype of engine to be made as compact as possible. Theaction of the engine may be described as follows: Afterthe fire is made the retort becomes heated to a dull red heat.This rise of… … Artificial Gems. P. Weiskopf gives in the Diamant the following formulaefor the frit or mass used in Bohemia for making imitationsof some of the precious stones: Imitation agates.—10 kilos quartz, 17 kilos red lead, 32kilos potash, 3 2 kilos borax, and 01 kilo arsenic. Thequantity of chloride of…
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