American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 148
ve, should be turned to theright by a given current, the same needle, if placed below the coil, with the positionof its poles reversed, would still be deflected to the rio-ht. A form of the detector galvanometer used in practice, is shown in Fig. 96. It isplaced on a tripod, with a ball and socket… … DETECTOR GALVANOMETER. 114 AMERICAN TELEGRAPHY for holding up the needles when not in use, thus taking the strain off the silk fibre.It will be understood from what has been said that the deflection of an instru-ment such as the detector, is not proportional to the current traversing the coils,…
Telegraph
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