. American telephone practice . 765 680 652 620 563 513 414 585 765 468 445 423 3^5 352 285 433 385 346 329 313 284 260 2IO 337 300 270 257 245 223 2 4 165 1,1541,130 900640450340235172 137 AERIAL CABLE 815 -»T3 .2 c 1615141210 9 8 76 Spans in Feet. no 120 125 130 140 150 174 200 Weights of 1000 Feet of Cable. Pounds. 6,146 5,432 5,036 4,814 4,5io 4,244 3,928 3,292 5,520 4974 4,520 4,320 4,i34 3,808 3,52o 2,948 4,430 3,994 3,630 3,47o 3,322 3,058 2,830 2,372 3,460 3,8 2,832 2,708 2,592 2,386 2,206 1,848 2,430 2,008 1,990 1,902 1,820 1,820 i,550 1,298 1,900 1,710 i,54o 1,4
. American telephone practice . 765 680 652 620 563 513 414 585 765 468 445 423 3^5 352 285 433 385 346 329 313 284 260 2IO 337 300 270 257 245 223 2 4 165 1,1541,130 900640450340235172 137 AERIAL CABLE 815 -»T3 .2 c 1615141210 9 8 76 Spans in Feet. no 120 125 130 140 150 174 200 Weights of 1000 Feet of Cable. Pounds. 6,146 5,432 5,036 4,814 4,5io 4,244 3,928 3,292 5,520 4974 4,520 4,320 4,i34 3,808 3,52o 2,948 4,430 3,994 3,630 3,47o 3,322 3,058 2,830 2,372 3,460 3,8 2,832 2,708 2,592 2,386 2,206 1,848 2,430 2,008 1,990 1,902 1,820 1,820 i,550 1,298 1,900 1,710 i,54o 1,484 1,420 1,306 1,206 1,008 1,285 i,i57 1,051 1,005 961 885 819 685 953 857 778 745 712 655 607 507 737 663 603 577 553 509 472 393 1 2,8182,5202,0301,580 I,IIO 860585 473337 The messenger wire may be supported in various ways, one ofwhich is to bolt what is called a messenger wire clamp to the side ofthe pole, which in turn serves to clamp the messenger wire in place. 592. A form of messenger clamp, This method is shown in Fig. FIG. 592.—MESSENGER WIRE CLAMPS. known as the Stroud clamp, shown in two views at the right ofFig. 592, has the advantage of requiring but one bolt to fasten theclamp block in place, a projection on the clamp block which passesinto the main portion of the support serving in lieu of the secondbolt. Another advantage of this type of clamp is that the Uo\\ Slo AMERICAN TELEPHONE PRACTICE. never need be taken entirely out, which prevents the separation andpossible loss of the clamping block and bolt. Where more than one or two cables are to be supported from apole, cable cross arms are often used, these being of angle iron con-struction, bolted to the pole as an ordinary cross arm and braced bycross-arm braces in some such manner as is shown in Fig. it is desired also to carry one or more bare wires, wooden crossarms may be secured within the angle iron arm as shown in thisFigure, on which wooden arm ordinary pins and insulators may besecured. The
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