The outlines of physics: an elementary text-book . Fig. 99. DENSITY 125 give in direct readings the degree of concentration of brineor the strength of an acid. 110. Hydrometers of Constant Immersion. — All of the hydrometers mentioned in Art. 109 have a common prin-ciple of action. They are called hydrometers of variableimmersion. Fahrenheit, the originator of the type of ther-mometer which goes by his name, devised an hydrometer,the slender neck of which carries but one mark. The instru-ment is constructed with a tiny scale pan above (Fig. 100),.

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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectphysics