Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 347
rmeans, will vary the contact resistance between the buttons,and thus vary the current strength in the telephone circuit.The induced currents in the telephone cause the disc toreproduce the original sounds. The telephone may be locatedat a considerable distance from the microphone, when… … Station 2 Seconoarv Seconoary
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
