Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 26
screw at the top of the standard. The motion ofthe lever is limited at the other upright by the two screwsat the left, their adjustment being fixable by the locknuts.The parts mentioned are mounted on a brass surbase whichis in turn mounted on the wooden base carrying the bind-ing posts that… … Fig. 7. ohms, but many have resistances up to 150 ohms; forlocal circuit use they are usually wound to a resistance of4 ohms. For enhancing and concentrating the signals emitted bysounders, these instruments are encased in resonators, suchas shown in Fig. 7. They are especially adapted for oper- 12…
Telegraph
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