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Scientific American, Vol. 88, No. 16 (1903) (1903)
leaf 4
in which the disk is designated by SENDING the letter a. The mercury, b, is contained in a cup, d. BATTERY /MOUCTANCE Spree LOCAL BATTERY (ar Electrical connection is made therewith through bind- 10 VOLTS ing screw, h,andthe platinum wire,c. A copper brush which bears on the shaft, 7, communicates… … © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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