The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 491
t. The handles of k are turned to the left for takingthe constant, and to the right for the cable or line test. Capacity Test.—For this test the handles of x are keptpermanently to the left, while those of k are turned to the left 462 PRACTICAL TELEPHONE HANDBOOK to charge, and to the right for… … Fig. 438.—Connections of National Telephone Co.s Test Set centres where a more sensitive and expensive set could notbe afforded. Fig. 440 shows the inside connections, the lower part beingthe bridge and conductivity arrangement, and the upper partthat used for the insulation test. The latter test…
Telephone
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