The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Hydrometer and Hydrometry
which it sinks. Hydrometers, graduated for special use so as to give the strengths of alcohol, ether, acids, or saline solutions at once, can be obtained from dealers in chemical apparatus; but the most generally useful graduation is that which gives the specific gravity. Several arbitrary hydrometer scales are in use. Tvvaddell's degrees are converted into specific gravities by multi-plying by 5, adding iooo, and cutting off 3 figures by the decimal point. Other conversions by the following tables: -
A. For liquids lighter than water. Temperature I2'5o C.