Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 42
ding itin the hand with the knob tothe prime conductor. Thehand furnishes a path forpositive electricity drivenoff from the outer coating,and for the return of nega-tive from the rubber, or the Charging the Leyden Jar? eal *■■ 3. JTow do avc know that any positive electricity is driven off?The… … 22 MANUAL OF TELEGRAPHY.
Telegraph
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