New York [etc.] Simmons-Boardman Pub. Co. [etc.] · leaf 41
ed by them. The ap-paratus registers the vertical oscillations of the footplate of the locomotive relative to the leading axleboxes, or in other words, the vertical play of thespring, and has been in use by the railway namedsince 1879. From an account of these devices appear-ing in London… … ing on a horizontal bar, this carrier being providedwith a marking point which bears upon a thin zincplate coiled on the drum shown, this plate beingcoated with a protective varnish which is scratchedoff by the point. The oscillations of the arm whichactuates the marking point also imparts, by…
Railroads · Railroad cars
Internet Archive · Carnegie Library of Pittsburgh · Public Domain Mark 1.0. Free to use for anything.
