action of the miter wheels, revolvethe rod, C. By this means, the red or danger side of the tar-get and the red light are displayed. On returning the lever,K, to its former position, the wire is loosened, and the weight,G, falls, turning back the lamp and target. The apparatus was devised by Mr. J.… … large audience the existence of weak as well as strong cur-rents of electricity, without the necessity of employing any ) 1872 SCIENTIFIC AMERICAN, INC 396 II [June 15, 1872. expensive or cumbersome accessories, such as a lantern toproject a magnified image of the galvanometer needle andscale on a…
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer02inte-262-136.webp)
