. American telephone practice . FIG. POLE BRACE. curve at the lower cross-arm, and frequently causes the pole to breakat that point, usually in the gain of the lower arm. On the other 92 AMERICAX TELEPHONE PRACTICE. hand, to guy from the lower cross-arm usually causes a pole to bowin the other direction with the same result. Where possible, the anchor should be placed 20 or 25 feet from thebase of the pole. When it is necessary to set the anchor 10 feet orless from the base of the pole, the pole should have a foundationformed of two planks 2 inches thick by 12 inches wide and 30 inch
. American telephone practice . FIG. POLE BRACE. curve at the lower cross-arm, and frequently causes the pole to breakat that point, usually in the gain of the lower arm. On the other 92 AMERICAX TELEPHONE PRACTICE. hand, to guy from the lower cross-arm usually causes a pole to bowin the other direction with the same result. Where possible, the anchor should be placed 20 or 25 feet from thebase of the pole. When it is necessary to set the anchor 10 feet orless from the base of the pole, the pole should have a foundationformed of two planks 2 inches thick by 12 inches wide and 30 incheslong set at right angles. To raise the guy wire to a considerable height in crossing a road along guy-stub securely anchored may be used, as shown in Fig. FIG. 568.—ANCHOR. Y\here it is not convenient to guy, a push pole brace, shown inFig. 567, may be used. To properly anchor guy wires often requires a good deal of inge-nuity, and it is hard to lay down any definite rule, as they frequentlyhave to be planned to meet the existing conditions. One of themost common methods, and a very satisfactory one, is shown in The anchor log should correspond in size to the depth of theexcavation in accordance with the following table: Anchor Log. Depth of Excavation. Length. Diameter. 4 feet 4 feet 6 inches 4 15■; 17 (5 6 8 12 ■ 3K \l 9 7 POLE LINE CONSTRUCTION. 793 When an excessive strain is to be met, an anchor of several logsbolted together crosswise may be used. The anchor rod shouldbe of wrought iron, from 6 to 10 feet long and from f to i^ inchesin diameter, having an eye forged in one end and a heavy screwthread and nut on the other. The rod should pass directly throughthe anchor log and be secured by the nut, a heavy iron wash
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