Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 580
follow in various directions toward the hole through which INDUCTION BY ELECTRIC CURRENTS. bright. 557A it passes, at which point the spark is verysheet of mica about 4x6 inches, having upon one sidea sheet of silver leaf 2X3 inches, may be used in some verypretty experiments. To apply the silver… … Rotary Disk. to ^ inch from the rods, which are connected with the ter-minals of the secondary coil—as shown in Fig. 533—the sparkleaps downward to the mica surface, and then travels in atortuous route to the vicinity of the point of the other rodand leaps upward. These sparks follow each other in…
Physics · Lantern projection · Electric apparatus and appliances
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![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-160-45.webp)
