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 1471
d sulphate of zinc (white vitriol). Mixuntil dissolved and let it stand half a day in a glass jar. Copper solution: Two and a half pints of soft water,4 ozs. of crystallized sulphate of zinc, 8 ozs. crystallized 1436 Steam Engineering Mix and let stand a sulphate of copper (blue vitriol),few hours… … Fig. 683gravity cell ready for use in the spot where it is to be used and pour in the coppersolution. Insert a glass funnel in the top of a piece of %-inchrubber tubing. Hold funnel so that lower end of the tubewill be in the middle of the jar and just a little above thebottom. Primary Batteries…
