. Railroad construction. Theory and practice . Fig. 171.—Standard Pipe Compensator. vice versa. Therefore this form of compensator can onh^ beused with pipes which will withstand compression. It has seemed impracticable to design an equally satisfactory^ com- ipensator for wires, although there are several designs on themarket. 1 Guides around curves and angles. When wires are required ito pass around curves of large angle, pulleys are used, and a slength of chain is substituted for the wire. For pipes, when ]the curve is easy the pipes are slightly bent and are guided Ithrough pulleys. When t
. Railroad construction. Theory and practice . Fig. 171.—Standard Pipe Compensator. vice versa. Therefore this form of compensator can onh^ beused with pipes which will withstand compression. It has seemed impracticable to design an equally satisfactory^ com- ipensator for wires, although there are several designs on themarket. 1 Guides around curves and angles. When wires are required ito pass around curves of large angle, pulleys are used, and a slength of chain is substituted for the wire. For pipes, when ]the curve is easy the pipes are slightly bent and are guided Ithrough pulleys. When the angle is sharper, angles areused. The operation of these details is self-evident from aninspection of Fig. 172. 310. Track circuit for automatic signaling. The severalsystems of automatic signaling differ in the minor details, but 1 §310. BLOCK SIGNALING. 333 nearly all of them agree in the following particulars. A currentof low potential is run from a l^attery at one end of a sectionthrough one line of rails to the other end of tlie se
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