Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 661
ng, a magnetized cambric needle, suspended by a finethread, is held near the ends of the needles in alternation.It is drawn toward both alike. After a current has been sent through the helices it willbe found that the darning needles are magnetic, but, owingto the opposite winding of the helices,… … Sturgeons Magnet. the Other. By placing a U-shaped piece of soft iron wire inthe helices, as shown in Fig. 615, the construction of the firstelectro-magnet (Sturgeons) is clearlv illustrated. In Fig. 616 is shown a device for projecting the incandes-cent lamp. It is suspended from two conductors,…
Physics · Lantern projection · Electric apparatus and appliances
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