Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1474
h thenozzle at right angles to barrel, holding about a pint, and ahydrometer should be obtained. The hydrometer (Fig. 688) is a hollow glass float loadedwith shot so as to- float upright. The heavier a liquid themore of the stem sticks up above the surface. These hydrometers are graduated on stem… … Fig. 6S6 USING UP OLD ZINCS The first signs of exhaustion in the cell will be a fadingof the deep blue color of the copper solution and a loweringof the line of separation between blue and white liquids. When this occurs drop in about an ounce of copper sul-phate in lumps. Be sure the lumps fall to…
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