. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 10. It is necessary that frogs be placed correctly withrelation to the track, and mechanical fastenings for thewires are therefore desirable, because they allow the frog tobe adjusted to the position giving the best results. The 10 ELECTRIC RAILWAYS. 22 satisfaction that any frog will give depends a great deal onhow it is put up. If put up level, the trolley is very likelyto follow the same direction as the car, but if allowed tosag down on one side, it will be a never-ceasing source
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 10. It is necessary that frogs be placed correctly withrelation to the track, and mechanical fastenings for thewires are therefore desirable, because they allow the frog tobe adjusted to the position giving the best results. The 10 ELECTRIC RAILWAYS. 22 satisfaction that any frog will give depends a great deal onhow it is put up. If put up level, the trolley is very likelyto follow the same direction as the car, but if allowed tosag down on one side, it will be a never-ceasing source oftrouble, due to its throwing the trolley wheel ofif the position for the frog may be found by the methodshown in Fig. 15, where a and /; are the main-line tracks,c and d the branch-line tracks, a b the main trolley wire,and /rthe branch trolley wire. The center of the trian-gle ;/ X in will be at a point t where the lines bisecting eachangle meet, and this determines the position of the frog. Itwill be a little removed from the center lines of the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
