Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1468
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 h5^drometers are graduated on stem… … Fig. 686using 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…
