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Scientific American, Vol. 56, No. 22 (1887) (1887)
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e ora large have lateral enlargements and point toward the nega- produced by the discharge from-the negative terminal induction coil; but this is an experiment for which it tive. Hoos would be difficult to find a subject. ‘The longitudinal groovings of the marks made by the sparks from the positive… … Fig, 8. Fig. 7. Fig. 6. © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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