Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 73
Fig. 72.—Direction of the Current. VOLTAIC ELECTRICITY. 55 the external end of the zinc plate, or wire connected thereto,the negative pole or electrode, Fig. 73. If we bring the -f-(plus sign for the positive) and — (minus sign for negative)wire from a cell together, making the circuit, the current…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
