Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
earth by a chain attachedto the ring in the handle of the box—the handle being in metalliccontact with the lining of the box. When handling powerful batteries, caution is requisite to avoidreceiving their shocks, else serious consequences might follow. A battery has been made embracing a hundred… … 700. Figure 26.—The electric spark.—The explanation ofYiQ, 26. ^ figure is contained in article 684. When a brass ball, at the endof a conducting-rod, is presented toa powerfully charged prime con-ductor, sparks are sometimes takenfrom it at a distance of thirty inches.
Physics · Astronomy
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