The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 318
Fig. 94. Fjg. 95. 302 DYNAMIC ELECTRICITY AND MAGNETISM. the left being narrower than the one on the right>the left pair of carbons are kept apart by this simpledevice till the pair on the right are consumed, whenthe change of resistance instantly brings the left pairinto contact, and the light…
Electricity · Magnetism
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