Electrical instruments and telephones of the U.S. Signal corps (1911) (14754183304)

Identifier: electricalinstru00unitrich (find matches)
Title: Electrical instruments and telephones of the U.S. Signal corps
Year: 1911 (1910s)
Authors: United States. Army. Signal Corps
Subjects: Military telegraph -- United States Military telephone -- United States
Publisher: Washington, Govt. print. off.
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN



Text Appearing Before Image:
5 B -6 ^ Q- Line to distant station Fig. 59.
Text Appearing After Image:
Fig. go.—Field biizzor.FIELD lUZZER ^lOOKI, 1!)()8. This instrument is shown in accomj)anyinir photographs. (Figs.60 and Gl.) The leather case containing the instrument is 8j by G by ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 105 6^ inches; wei;ht, J) pounds. This case is divided into tAvo compart-ments by a vertical partition. One part contains 5 cells of dry bat-tery, a condenser having a capacity of 0.05 microfarad, and a resist-ance coil of 25 ohms. The other part holds a head receiver and atransmitter. A hard-rubber plate covers the last-named compart-ment, and this plate supports a simple make-and-break key, a circuitbreaker, a buzzer coil, together with the line and ground binding-posts.