. Electric railway journal . ent poles, and then following the ver-tical line through that point to the bottom of thechart where the pull is read off. For example, ifthe adjacent poles were 70 ft. from the corner pole and the 120-ft., 110-ft., etc., lines downward. By takingthe pull 39 ft. on the 130-ft. basis we get the ratioof 3 to 10 between the distance from corner to lineand from corner to point fixing the line, and the off-sets for that angle will be 36 for 120 ft., 33 for 110 ft.,etc. Strain Must Be Opposed by an Anchorageof Some Sort Opposed to the strain resulting from the corner wene
. Electric railway journal . ent poles, and then following the ver-tical line through that point to the bottom of thechart where the pull is read off. For example, ifthe adjacent poles were 70 ft. from the corner pole and the 120-ft., 110-ft., etc., lines downward. By takingthe pull 39 ft. on the 130-ft. basis we get the ratioof 3 to 10 between the distance from corner to lineand from corner to point fixing the line, and the off-sets for that angle will be 36 for 120 ft., 33 for 110 ft.,etc. Strain Must Be Opposed by an Anchorageof Some Sort Opposed to the strain resulting from the corner weneed some form of anchorage, the effective value ofwhich is modified by the angle it makes with the strain,which, except in special cases where it is inclined toan extent which necessitates consideration of that fact,is taken as horizontal. This angle, it will be remem-bered, is measured by the relation of the lead, thehorizontal distance from the base of the pole to a pointon the guy at that level, to the height, the distance. and the latter was 30 ft. from the line between theadjacent poles, we find 30 at the left, follow it to theinclined 70, and drop down vertically at 43 which isthe pull. If the two adjacent poles are not equally distantfrom the corner pole the correct value for the pull isfound by measuring from the middle of the line be-tween them to the corner, and using the average oftheir distances for the value of the inclined line. A similar diagram for the Western Union basis of130 ft. is readily made by remembering that the dis-tance from corner pole to line for any given angle isproportional to the distance from the corner pole tothe point through which the line goes. If a diagramis laid off, except as to inclined lines, just like theone shown, the line at an angle of 45 deg., as isthe 100-ft. line here, would then be the 130-ft. we start where the horizontal 39-ft. line cuts thisand lay off 3-ft. points on each side on the vertical39 line, the inclined lin
Size: 2332px × 1072px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
