Telegraphy and how to learn it; with brief chapters on elementary science, embracing various kinds of electricity, electrical measurements, thermo-frictional electricty, batteries, magnets and magnetism (1901)
Frederic, Wilson. [from old catalog] · Chicago, The Henneberry co · leaf 85
ith the copper of the second, the 82 TELEGRAPHY. zinc of the second with the copper of thethird, and so on throughout the whole se-ries. It matters not which pole we com-mence with, if we are only careful never toconnect like poles; but this law must be asstrictly adhered to in joining batteries… … FIG. 16 point at any distance away, and also con-nected with the earth, the current will flowas readily as though the circuit has been FRICTIONAL ELECTRICITY. 83 made complete by use of a return wire. Itis therefore shown that the earth is reallyone vast conductor. This is principally dueto the…
Telegraph
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