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 Engineer v 200 n 5190 July 15 1955 p 89)
Instantaneous Measurement of Speed
Engineering
Engineering ; 180 , n 4670
1955
Article (Journal)
English
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