Image from page 303 of "Our iron roads: their history, construction and administration" (1883)
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Description
Identifier: ourironroads00will Title: https://www.flickr.com/photos/internetarchivebookimages/tags/bookidourironroads00will">Our iron roads: their history, construction and administration Year: https://www.flickr.com/photos/internetarchivebookimages/tags/bookyear1883">1883 (https://www.flickr.com/photos/internetarchivebookimages/tags/bookdecade1880">1880s) Authors: https://www.flickr.com/photos/internetarchivebookimages/tags/bookauthorWilliams__Frederick_Smeeton__1829_1886">Williams, Frederick Smeeton, 1829-1886 Subjects: https://www.flickr.com/photos/internetarchivebookimages/tags/booksubjectRailroads____History">Railroads -- History https://www.flickr.com/photos/internetarchivebookimages/tags/booksubjectRailroads____Great_Britain">Railroads -- Great Britain Publisher: https://www.flickr.com/photos/internetarchivebookimages/tags/bookpublisherLondon___Bemrose___sons">London : Bemrose & sons Contributing Library: https://www.flickr.com/photos/internetarchivebookimages/tags/bookcontributorUniversity_of_California_Libraries">University of California Libraries Digitizing Sponsor: https://www.flickr.com/photos/internetarchivebookimages/tags/booksponsorMSN">MSN View Book Page: https://archive.org/stream/ourironroads00will/ourironroads00will#page/n303/mode/1up" rel="noreferrer nofollow">Book Viewer About This Book: https://archive.org/details/ourironroads00will" rel="noreferrer nofollow">Catalog Entry View All Images: https://www.flickr.com/photos/internetarchivebookimages/tags/bookidourironroads00will">All Images From Book Click here to https://archive.org/stream/ourironroads00will/ourironroads00will#page/n303/mode/1up" rel="noreferrer nofollow">view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: oking through the glass sides of their cell, and inpulling this way or pushing that way some of the levers whichare arranged before them. These levers work all the 32 pointand 35 signal levers ; 67 in all. Every lever is numbered, andon the floor beside it there is fixed a brass plate engraved withits name and use. All the point levers are black, the up signalsare red, the down signals blue, and the distant signals yellow. \ Q{ R [RON K<\1S. Many of them, too, have numbers, sometimes half a dozen orpainted on their sides, and these numbers involve thewhole secret of the safety which is secured by the mechanism,as will be readily understood if we examine the principles onwhich it is devised. The keys and pedals of an organ, as is well-known, commandnumerous valves admitting air from a wind-chest to the pipeswhich it is desired to sound. The key-boards are sometimesdouble or triple, and are occasionally arranged so that theperformer sits with his back to the instrument. The pipes are Text Appearing After Image: .U.N STREET STATION SIGNALS. generally spread over a large space, and sets of them are some-times enclosed in separate chambers. There thus arises con-siderable complexity in the mechanism by which the severalkeys are made to operate on their respective air valves. Never-theless, by means of rods, cranks, and levers, such a connectionis effected, that on depressing a C key, not one C pipe only, butit may be twenty C pipes are made to sound, in whatever partof the instrument those pipes may be situated. And so it iswith the points and signal levers of the Cannon Street platform.The whole row may be considered to form a key-board of five INTERIOR OF LONDON BRIDGE SIGNAL-BOX. 285 and a-half octaves, every key of which is connected by suitablecranks and rods to some one of the sixty-seven points andsemaphores which have to be played upon. In the organ atouch of the finger serves to depress a key, for the movementhas only to admit a puff of air to certain pipes—but here thekeys require a Note About Images Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work. -
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Link: https://www.flickr.com/photos/126377022@N07/14737320936/
Resource type: Image
Added by: Simon Cotterill
Last modified: 3 years, 9 months ago
Viewed: 299 times
Picture Taken: 1883-01-01T00:00:00 -
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