. Electric railway journal . Dessau-Bitterfeld Railway—Construction at the End of aTension-Regulating Section fitted with struts. The bridge shown on page 980 is approx-imately 230 ft. long and spans thirteen tracks. The overhead line is sectionalized about every 3280 center of each section is rig-idly anchored, while the Dessau-Bitterfeld Railway—Horn Switch Section CircuitBreakers falls the two suspension points of the messenger cable ap-proach one another, because of the contraction of the ten-sion wire, thus equalizing the reduction of the sag. Hence,as the sag of the messenger cabl
. Electric railway journal . Dessau-Bitterfeld Railway—Construction at the End of aTension-Regulating Section fitted with struts. The bridge shown on page 980 is approx-imately 230 ft. long and spans thirteen tracks. The overhead line is sectionalized about every 3280 center of each section is rig-idly anchored, while the Dessau-Bitterfeld Railway—Horn Switch Section CircuitBreakers falls the two suspension points of the messenger cable ap-proach one another, because of the contraction of the ten-sion wire, thus equalizing the reduction of the sag. Hence,as the sag of the messenger cable is kept practically con- Trolley Clam]:. Electric Ry- -hyumttl Dessau-Bitterfeld Railway—Details of the Catenary Line Construction and Insulators two ends are kept taut by automatic tension devices, so thatthe supporting wires are under approximately the sametension at all temperatures. Both the trolley wire and themessenger cable are kept under tension. A third wire isprovided to insure the uniform tension of the messenger stant at all temperatures, the contact wire remains perma-nently in a practically horizontal position. A drawing on this page shows the suspension of the over-head line at a pole or bridge. It will be observed that themessenger cable itself does not rest directly on the spool November 4, 191 r.] ELECTRIC RAILWAY JOURNAL. 983 or Diabolo insulator, but is led under the supporting-structure in the form of an unbroken loop which is sus-pended from the insulator by stranded wire at about each side of the support. The auxiliary tension wireis looped under in the same manner and clamped to themesse
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