. The practical telephone handbook and guide to the telephonic exchange . rut to the pole the latter should not be cutinto, but the top of the strut should be cut out to the curve ofthe pole, and fixed by a long bolt with nut and bevelled washer,as shown in Fig. 340. In some cases when stays or struts cannot be used it is betterto truss the pole, as shown in Fig. 341,where an out-rigger, a, is screwed to the poleon the opposite side to the pull (the direc-tion of the latter being shown by an arrow-head), and a strong stay is passed through an eye in the end of the outrigger, and attached to a
. The practical telephone handbook and guide to the telephonic exchange . rut to the pole the latter should not be cutinto, but the top of the strut should be cut out to the curve ofthe pole, and fixed by a long bolt with nut and bevelled washer,as shown in Fig. 340. In some cases when stays or struts cannot be used it is betterto truss the pole, as shown in Fig. 341,where an out-rigger, a, is screwed to the poleon the opposite side to the pull (the direc-tion of the latter being shown by an arrow-head), and a strong stay is passed through an eye in the end of the outrigger, and attached to a stay rod and block buried near the foot of the pole, the stay rod being provided with a stay tightener to strain the stay as shown at ground resistance to the pole should be strengthened by fixing stay blocks at right angles and on opposite sides of the pole, as Fig. 340. shown at c and d, so that the pull of the wires will tend to press the pole against each of the blocks. This plan should be adopted with ordinary poles where the ground is soft and yielding. 4-:. -Pole Strut Fig- 341.— OVERHOUSE WORK Trussed Pole In good modern work in towns nearly all the wires are carried in underground cables ; but it is stillnecessary to run a number of wires overhead for the distribu-tion of the lines from the ends of the cables, which are usuallyterminated on what is called a distributing pole. These, wherez 348 PRACTICAL TELEPHONE HANDBOOK possible, should be ground poles, but in towns cases arise whereroof poles are a necessity. Iron Poles.—For greater neatness and lightness, the poles
Size: 1023px × 2443px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelephone, bookyear19
