Apparatus for instantaneous detection of train speeds on London Transport system, designed by R.DELL, brought into use at Victoria on district line; detector consists of length of conductor rail laid alongside track; below this rail are 12 permanent magnets and coils spaced 9 in. apart. (see also Engineering v 180 n 4670 July 29 1955 p 156)
Instantaneous measurement of speed
Engineer
Engineer ; 200 , n 5190
1955
Article (Journal)
English
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Instantaneous speed measurement
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