A pioneeing attempt at multiplex telephony

A step-by-step narration is given of the conception in the 1890's of multiplex telephony by John Stone Stone. Much of this fascinating story is told in Stone's own words as taken from testimony at patent interference hearings. Beginning with his early and tentative ideas on the use of electrical resonance, the story takes us to the point where he had conceived a complete multiplex system. Although he eventually received an unfavorable court decision on his patent application, Stone nevertheless made a brilliant contribution to modern communication technology.