Description of Tel RT835 instrument introduced by Hasler Telegraph Works, London; it is of graphic recording type for checking speed of locomotives, rail cars, and all classes of vehicles, as well as machines; instrument is fitted with clock which runs for 30 consecutive hours.
New speed indicator and recorder for locomotives
Ry Gaz
Railway Gazette and Railway News ; 64 , n 8
1936
2 pages
Article (Journal)
English
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