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 1481
t is slipped a strawboard tube. The objectis to prevent the zinc of two batteries from touching eachother so as to establish a wrong connection. The negativeelectrode is a plate of carbon. This is placed in the centerof the zinc, and is so supported as not to touch it in anyplace. Carbon and zinc… … Fig. 692 DRY CELL Ammonium chloride, zinc chloride, 1 part of each, plasterof Paris, 3 parts, flour 0.87 part, water 2 parts. After thishas set a little, the wooden template is withdrawn, the car-bon is inserted in the cavity left by its withdrawal, and thespace left unfilled is filled with the…
