Proceedings of the Annual Convention Volume 1-11

Proceedings of the Annual Convention Volume 1-11

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 edition. Excerpt: ... awakening closer inquiry into this important subject. H. W. REED. INTERLOCKING DEVICES. The following report was submitted and accepted: To the President and Members of the Roadmasters' Association of America: Your Committee on Interlocking beg leave to submit the following report: The grouping of signals and switches in such a manner that their movements are made mutually dependent, and so constructed that it is impossible to make these movements except in a prearranged order, is called "interlocking." The fundamental principle of the system is that an operator or signalman will be unable through inadvertence, carelessness or maliciousness, to give conflicting or dangerous signals. Early in the history of railroading it had begun to be the custom to concentrate as many switch and signal levers together as could be conveniently worked by one man. This concentration introduced the danger of the signalman pulling the wrong lever by mistake. To provide against such danger a Mr. Stevens of England secured in 1846, a patent for an apparatus by which the signalman moved the switch levers with his hands and the signal levers with his feet. The first Stevens machine was crude and there was no mechanical obstacle to prevent the operator from moving the signal lever before he moved the switch lever: nor was there any connection between the different levers, yet it furnished the idea which lead up to a perfected machine. In 1856 a Mr. Saxby, also of England, introduced his system by which the switches and signals of any junction, however complicated, were connected together in such a way that it was a mechanical impossibility for the position of the switches to be at any time contradictory to the position of the signals, or more

Product details

  • Paperback
  • 189 x 246 x 2mm | 95g
  • United States
  • English
  • black & white illustrations
  • 1236924797
  • 9781236924797