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 17
the circuit. An arrangement of acidulated water andtwo metals is called a voltaic cell, element,or pair. A series of cells, properly con- 14 TELEGRAPHY^ nected, is called a battery, though this termis sometimes applied to a single cell. It is necessary, in defining a current, toknow its direction;…
Telegraph
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