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. (1916)
American Technical Society · Chicago : American Technical Society · leaf 352
catenary trolley-wire support has been developed to over-come this difficulty. As mentioned briefly before this system com-.prises a steel messenger wire securely mounted on insulators. Fromthe messenger wire, the trolley wire hangs by hangers located atintervals along the messenger wire. There may… … 212 ELECTRIC RAILWAYS The insulators for the messenger wire may be mounted onbrackets, on span wires or on Ught bridge construction. All of theseforms of support are illustrated in Figs. 197, 198, and 199. Where sidewise stiffness is required, two messenger wires maybe used with hangers from each…
Electrical engineering
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