[Electric engineering.] . reaks in the line wire due to the slight bending and unbend-ing that the wire is subjected to. These advantages are,however, more than offset by the difficulty of trimming ifthe lamps are mounted high above the street. Fig. 44shows a more ornamental style of pole-top mounting. Inthis case, the lamp is only about 20 feet above the street,and as it is used with enclosed arcs, which are trimmedabout once in a week or ten days, the climbing up to thelamp is not as much of an objection as when open arcs,requiring daily trimming, are used. 94. Fig. 45 illustrates a typical
[Electric engineering.] . reaks in the line wire due to the slight bending and unbend-ing that the wire is subjected to. These advantages are,however, more than offset by the difficulty of trimming ifthe lamps are mounted high above the street. Fig. 44shows a more ornamental style of pole-top mounting. Inthis case, the lamp is only about 20 feet above the street,and as it is used with enclosed arcs, which are trimmedabout once in a week or ten days, the climbing up to thelamp is not as much of an objection as when open arcs,requiring daily trimming, are used. 94. Fig. 45 illustrates a typical mast-arm general arrangement will at once be seen from thefigure. The lamp is raised and lowered by means of arope and pulleys, and is provided with a small hood /;to protect the top from the weather. The lamp is sus-pended from the rope by the intervening cross-arm a and 82 ELECTRIC LIGHTING. 18 insulator b. A cross-arm and insulator of this kind shouldbe provided in order to secure good insulation between. Fig. 45. the lamp and the pole fixture and also to keep the linewires spread apart.
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