. Development and electrical distribution of water power . ole dimensions were specified: For a length of 40 ft Tops 8 ins., butts 15 ins. For a length of 50 ft Tops 9 ins., butts 16 ins. For a length of 60 ft Tops 10 ins., butts 18 ins. 246 DEVELOPMENT AND DISTRIBUTION OF WATER POWER The cross-arm braces are of ij-inches X 3-16-inch angle iron3 feet, 7J inches long. The main transmission cross-arms are 7 feet 4 inches long and5X7 inches in section. There are in all 12 telephone boothsin miles of line. There is a patrolmans cottage at the half-way point, the other patrolmen living at Tayl
. Development and electrical distribution of water power . ole dimensions were specified: For a length of 40 ft Tops 8 ins., butts 15 ins. For a length of 50 ft Tops 9 ins., butts 16 ins. For a length of 60 ft Tops 10 ins., butts 18 ins. 246 DEVELOPMENT AND DISTRIBUTION OF WATER POWER The cross-arm braces are of ij-inches X 3-16-inch angle iron3 feet, 7J inches long. The main transmission cross-arms are 7 feet 4 inches long and5X7 inches in section. There are in all 12 telephone boothsin miles of line. There is a patrolmans cottage at the half-way point, the other patrolmen living at Taylors Falls and Min-neapolis. For crossing lakes four sizes of steel towers are used—40, 45, 50, and 60 feet in height. Conductors are spaced 7feet apart on towers. There are 27 steel towers on the line onaccount of the large number of bogs and lakes to be telephone wire is No. 10 semi-hard-drawn copper. Doublecross-arms are used at all curves and pronounced changes in theprofile. Fig. 126 is a drawing giving dimensions and foundation details. Fig. 127.—Transposition of Conductors. for use when crossing a narrow stream. Fig. 127 shows the ar-rangement at the transposition of the transmission transposition of one-third turn occurs every 3\ miles. A doublepole is used for this purpose. The telephone line is transposed TAYLORS FALLS PLANT 247 every tenth pole. Fig. 128 shows a pair of steel towers at the cross-ing of Leedholm Lake. Insulators and Pins.—The transmission-line insulator used isknown as S. & W. No. 1, made by Locke. A cross-section of this # /FT /
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