. Electric railway journal . nsystem. The lines were built entirely onwooden poles and these poles would atany point be the same whatever thecharacter of pole-top construction character of insulators or con-ductors. On the other hand, the pole-topconstruction would be practically in-dependent of poles and insulators seem to be more inti-mately related to the conductors thanto the cross-arms. In view of theseconsiderations the analysis was aimedtoward a study independently of poles,pole tops and circuits. With the polesin place any one of the established set of types ofpol
. Electric railway journal . nsystem. The lines were built entirely onwooden poles and these poles would atany point be the same whatever thecharacter of pole-top construction character of insulators or con-ductors. On the other hand, the pole-topconstruction would be practically in-dependent of poles and insulators seem to be more inti-mately related to the conductors thanto the cross-arms. In view of theseconsiderations the analysis was aimedtoward a study independently of poles,pole tops and circuits. With the polesin place any one of the established set of types ofpole tops would then be erected on these poles to sup-port any type of circuit existing on the system. The company had on file route maps of the lines andthese were found to be accurate as to lengths of linesand numbers of poles, location of special crossings, etc.,but did not give the type of pole top nor the height ofthe individual pole. It was therefore decided to makea quick field inspection to determine the number of poles. FIG. 8—TRANSMISSION SYSTEM, POWER PLANTSAND SUBSTATIONS May 28, 1921 Electric Railway Journal 991 of each size, the number of double cross-arms(at angles, etc.), the number of special cross-ings (over railroads, other wire lines, etc.),the number of H-frames (at dead-ends and an-gles), of anchor guys, braces, head guys, andstubs. At the same time the points of transi-tion from one type of pole top or circuit toanother could be noted as well as the fewirregularities not covered by type treatment. It was found that the number of poles perthousand feet averaged , giving an averagespan length of feet, and that the poleswere distributed as to size as follows, 10 percent being set in rock, the remainder in me-dium earth: TABLE II—QUANTITIES OF EXCAVATION AND BALLASTFOR VARIOUS KINDS OF TRACK Track Excavation Cubic Yards per lou Liueal teut Pole Height, Poles Feet per 1,000 ft. Per Cent 35 40 45 50 48 55 18
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