Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 608
rop of sealing wax. A fine copper wire is wound aroundthe carbon, D, and connected with the battery. TELEPHONE, MICROPHONE, ELECTRICAL MAGIC. 585 These instruments are used as transmitters; a Bell tele-phone is used as a receiver. By using a number of rods,pencils, or pendants instead of a single… … Microphone with Pendants. whistling, instrumental and vocal music, and, under f.avora-ble conditions, articulate speech, whispering, etc. ELECTRICAL MAGIC. Electricity in its ordinary every-day uses surpasses allthe feats of the ancient magi or modern prestidigitators.Sending light, heat, power,…
Physics · Lantern projection · Electric apparatus and appliances
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