Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 614
, MICROPHONE, ELECTRICAL MAGIC. 591 downward and terminates in several points disposed abouta circle concentric with the bottom of the pot. The zincpole of the battery is provided with a wire having severalterminal points alternating with the points previously men-tioned. The bottom of the pot is…
Physics · Lantern projection · Electric apparatus and appliances
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