Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . justment of the position of the upper race. The outerball race is carried by the swivel. This mounting gives practicallya frictionless support for the swivel and pole socket. Pole. Trolley poles are made of light, high-grade steel tubingabout I inch in thickness and of a length determined
Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. . justment of the position of the upper race. The outerball race is carried by the swivel. This mounting gives practicallya frictionless support for the swivel and pole socket. Pole. Trolley poles are made of light, high-grade steel tubingabout I inch in thickness and of a length determined by the heightof the trolley wire above the car roof. The angular elevation of thetrolley pole may be approximately 30 degrees. This will requirepoles between 12 and 18 feetin length. The steel of thepoles is reasonably soft sothat in general they will bendrather than break under ordi-nary shocks. The tubes aretapered from a point severalfeet from the upper end and they have an outside diameter at the buttfrom If to 2 inches. The standard outside diameter at the upper endis 1 inch, the inside being reamed to fit the standard harp shank. Atthe butt end the poles are reinforced by a length of tube inside, thelength and strength of this being determined by the service to whichthe poles will be Fig. 104. Trolley Harp for Holding Pulley 205 no ELECTRIC RAILWAYS Harp. The trolley harj) is the device which is mounted on theupper end of the i)ole to carry the trolley wheel. A typical harp is
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Keywords: ., bookauthoramericantechnicalsoci, bookcentury1900, bookdecade1910
