. American telephone practice . xposed ends to be sure they are properly cleared fromeach other and from the sheath. If it is still found to be should be plainly tagged. 854 AMERICAN TELEPHONE PRACTICE. In the manner just described, twenty-five minutes with two menshould be ample time for testing one hundred wires, the testing op-erator listening and his helper attending to the connection of thedifferent wires at N. For this test, as well as many others, it is very convenient touse a regular operators receiver and head band, as it will save thetester a very tired arm at the end of
. American telephone practice . xposed ends to be sure they are properly cleared fromeach other and from the sheath. If it is still found to be should be plainly tagged. 854 AMERICAN TELEPHONE PRACTICE. In the manner just described, twenty-five minutes with two menshould be ample time for testing one hundred wires, the testing op-erator listening and his helper attending to the connection of thedifferent wires at N. For this test, as well as many others, it is very convenient touse a regular operators receiver and head band, as it will save thetester a very tired arm at the end of a long test. As a matter of fact,the receiver is little appreciated as a testing instrument. A veryconvenient set is formed by a watch-case receiver and head band,and two small-sized cells of dry battery, strapped together so asto be carried in the coat pocket. The receiver and battery are con-nected in series, the free terminals of the circuit being formed byflexible cords about four feet long. These cords should terminate in. FIG. 625.—CONTINUITY TEST. convenient clips, or contact points adapted to make contact with thewires to be tested. This arrangement leaves both hands free at alltimes, and is wonderfully sensitive. The continuity test, or test for broken wires, may be made withthe same simple instruments. The wires to be tested should all begrounded or connected to a return wire at the far end. At the nearend, one pole of a magneto bell, or of the battery and galvanoscope,or of the receiver, should be connected to ground or the return wireand the other terminal connected successively to the terminals of theline, which, of course, should all be separated. A ring in the case ofthe magneto, or a permanent deflection of the needle in the case ofthe galvanoscope, or a continuous clicking in the receiver, will indi-cate that the wire is continuous. The same precaution as previously TESTING. 855 pointed out must, however, be observed with the magneto bell. Thissame test for
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