Modern Gasworks Practice

05 ©5 IC MODERN GASWORKS PRACTICE is used, as a track return is then permissible ; but when current is derived from a town supply positive and negative leads should be fitted. Track Switches The method adopted for coupling up fixed brauch lines to a main telpher track by means of track switches is clearly seen in Figs. 244 and 245. A double-rail steel casting is pivoted on the top of main track (the latter not being cut through by the leaving sufficient clearance for the telpher machine to pass. simple and easy to operate, a force of about 20 Ib. at the switch), and it will also be observed that anotlier small lengtli of rail is carried by a swinging arm (generally of channel section) hinged to the side of the track joist. When the switch is operated for connec-tion of the brauch track the pivoted rail casting and the swinging rail at the side come into line simul-taneously, and thus form a perfectly smooth curve between the fixed end of the brauch and the main track. S i m i 1 a r 1 y, when the switch is opened for through traffic on the main track, the o t h e r (straight) half of the rail casting falls back into exact alignment witli the fixed main line rail, and the swinging arm folds back close to the main track gilder, cutting the brauch, out, and The gear is extremely end of a 15-inch lever