. The Bell System technical journal . Fig. 5—Wind vane mounted on pole of Line 1. 204 BELL SYSTEM TECHNICAL JOURNAL. MAXIMUM WIND VELOCITY5-MINUTE AVERAGE WIND VELOCITY pjg_ 6—Frequency distribution of the ratios of maximum instantaneous velocities tofive-minute average velocities as recorded by the Burton anemometer. Method of Treating DataThe data considered necessary for the characterization of any pairarrangement were: 1. The number of contacts. 2. The simultaneous velocity and direction of the wind. 3. The sags of the wires. 4. The air temperature (because of its effect on
. The Bell System technical journal . Fig. 5—Wind vane mounted on pole of Line 1. 204 BELL SYSTEM TECHNICAL JOURNAL. MAXIMUM WIND VELOCITY5-MINUTE AVERAGE WIND VELOCITY pjg_ 6—Frequency distribution of the ratios of maximum instantaneous velocities tofive-minute average velocities as recorded by the Burton anemometer. Method of Treating DataThe data considered necessary for the characterization of any pairarrangement were: 1. The number of contacts. 2. The simultaneous velocity and direction of the wind. 3. The sags of the wires. 4. The air temperature (because of its effect on wire sag). 5. The weather, particularly the presence or absence of glaze. TELEPHONE LINE WIRE SPACING PROBLEMS 205 To simplify to some extent the long process of correlation andanalysis, first, the velocities recorded at 16 directions to the line wereconverted to normal velocities, which should be borne in mind inconsidering the results. This conversion was made by multiplyingthe recorded velocities by the cosine of the angle between the normalto the line and the true direction of the wind. The propriety of
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