for pro- experiments in general. Two forms of this battery ducing the electrical light. gutta-percha wire. They may be of any length most are shown in Figs. 5 and 6, the one being circular and Mines may be sprung at a considerable distance convenient from 6 inches upwards. In the annexed the other… … sufficiently powerful for firing a shot will be from percha covering for a length of about a quarter of an fifteen to fifty, according to cireumstances. inch, as shown at, C C, Fig. 1, and brighten up the ends with sand paper, and then stretch across them a CIRCULAR CELL BATTERY. very fine iron, or…
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