. Electric railway journal . block. The pole was set 8 ft. from the center of the track andthe bracket was 22 ft. 7y2 in. above the top of were attached to the bracket 8 ft. from the centerof the pole as shown in another one of the accompanyingillustrations. The lower end of the cable was anchoredto a tie, and a dynamometer for measuring the loadwas fastened to the cable. Just above the dynamometera standard pull jack was secured to the cable suspendedfrom the bracket and to the dynamometer. This pulljack applied the loads, which varied from 200 lb. to 1700lb. The results of this t
. Electric railway journal . block. The pole was set 8 ft. from the center of the track andthe bracket was 22 ft. 7y2 in. above the top of were attached to the bracket 8 ft. from the centerof the pole as shown in another one of the accompanyingillustrations. The lower end of the cable was anchoredto a tie, and a dynamometer for measuring the loadwas fastened to the cable. Just above the dynamometera standard pull jack was secured to the cable suspendedfrom the bracket and to the dynamometer. This pulljack applied the loads, which varied from 200 lb. to 1700lb. The results of this test are shown in the table form-ing a part of the illustration of the pole design indicated there, the loads applied are shown in thecenter column, the deflection at the top of the pole in thefirst column to the left, and the set at the top in thesecond column to the left. The deflection in the bracketat the point in line with the cable on which the load wasapplied, is shown in the first column to the right of the. Sat at Deflection Load in Pounds Deflection Set at A at A atB atB B 0 O 200 0 0 0 too V 0 2 600 IW 0 0 jY BOO 2i 0 0 4Y 1000 4 0 0 sV IIOO 4Y 0 0 6 200 0 0 7 1300 0 7V 1400 sY V a¥ 1500 /V % 9 1600 sY iM> Evidenceof 1700 sV Failure ^g1!! 3 TESTING RIG APPLIED TO EXPANDEDSTEEL POLE //- EXPANDED STEEL POLE READY FOR TEST AND AT THE POINT OFFAILURE one indicating the load, and the set in the bracket atthis point is shown in the second column to the right. In each instance and immediately following the appli-cation of the load and recording the deflection, the loadwas released to allow the pole to recover. This was donein order to determine the elastic limit of the pole and tomeasure the set. As shown in the table, the pole andarm fully recovered upon releasing the loads up to 1300lb. At 1400 lb. the top of the pole took on a set of 5/16in., and the bracket in line with the pulling cable showeda set of % in. When a 1700-lb. load was applied thepole began t
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
