. American telephone practice . FIG. 612.—TEN-PAIR TERMINAL DISTRIBUTING TO RESIDENCES. copper if bare. If both are insulated, they should be not smallerthan No. 16 rubber-covered and braided, unless they are twisted, inwhich case they may be as small as No. 18. Frequently one bareand one insulated wire is used, these being run separate in practi-cally the same manner as two bare would be run. In this caseboth wires should be of No. 14 hard drawn copper. In Figure 612 is well shown the methods of extending drop wires53 834 AMERICAN TELEPHONE PRACTICE. from a multiple tap terminated in a can to
. American telephone practice . FIG. 612.—TEN-PAIR TERMINAL DISTRIBUTING TO RESIDENCES. copper if bare. If both are insulated, they should be not smallerthan No. 16 rubber-covered and braided, unless they are twisted, inwhich case they may be as small as No. 18. Frequently one bareand one insulated wire is used, these being run separate in practi-cally the same manner as two bare would be run. In this caseboth wires should be of No. 14 hard drawn copper. In Figure 612 is well shown the methods of extending drop wires53 834 AMERICAN TELEPHONE PRACTICE. from a multiple tap terminated in a can to the various subscribershouses. Figure 613 shows a can at the top of a pole feeding to a 3 >. FIG. 613.—TWENTY-FIVE-PAIR TERMINAL DISTRIBUTING TOBUSINESS BLOCK. distribution ring from which the various drop wires are led. Thesecuts were loaned by Mr. L. W. Stanton, whose construction workthey represent. CHAPTER CABLE CONSTRUCTION. It is now settled practice to place all telephone wires undergroundin the business centres of large cities, and even to do so in the cen-tral parts of smaller cities. The primary requisite for this construc-tion is that a suitable conduit shall be provided in which the con-ductors may be laid. It is usually necessary to provide conduitshaving a suitable number of ducts to meet the requirements forfuture as well as immediate use, and much judgment should beexercised in this respect in planning the system. Suitableopenings are provided for the conduits at frequent intervals,these being in the form of manholes, from which sections of thecables may be drawn into the ducts and withdrawn when occasionrequires, for repairs. The principal r
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