American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 147
of the current strength in a circuit must be due to a doubling of the re-sistance, etc. In some forms of tangent galvanometers one-halfof the circumference of the dial is allotted to a scaleon which the tangent of the angle, instead of the de-gree of the angle, is marked. This avoids referenceto a… … ASTATIC GALVANOMETER. In order to eliminate as much as desired the effectof the earths magnetic influence upon the needle of agalvanometer, and thereby to make it more sensitiveto the magnetic influence of the coil, at least, two de-vices have been employed. One of them consists ofplacing a…
Telegraph
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
