Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 665
ning the presence and magnitude offoreign currents ; seventh, tests for locating trouble in the switch-board ; eighth, miscellaneous tests. These will be briefly taken upin their order. Tests for grounds may be made in two ways, by means of thevolt-meter, or by the use of relay, R, connected… … 044 AMERICAN TELEPHONE PRACTICE. of any other circuit by means of the volt-meter, the cord circuit ofFig. 472 has been redrawn in part in Fig. 473, all parts not directlyconcerned in volt-meter tests being omitted. In making tests for grounds, throw the volt-meter key, No. 4, leav-mg the other keys…
Telephone
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
