Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 657
oss section, one-fourth inch wideand one-eighth inch deep, separated a short distance at oneend of the coil, so that the current may be sent around theneedle through the copper trough alone when desirable. In the trough is wound a quantity of No. 40 silk-cov-ered copper wire, forming the coil, B,… … Sci. \
Physics · Lantern projection · Electric apparatus and appliances
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