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Electric eye alines movable bridge span
Means of accurately aligning moving span of bridge by means of photoelectric cell, devised by G. T. JOHNSON; bridge to which application has been made is 4-track structure with swinging span which can be operated through arc of 180 deg, 90 deg on each side of tracks; spans Norwalk river at South Norwalk, Conn. (see also Ry Elec Engr v 23 n 11 Nov 1932 p 265-6)
Electric eye alines movable bridge span
Means of accurately aligning moving span of bridge by means of photoelectric cell, devised by G. T. JOHNSON; bridge to which application has been made is 4-track structure with swinging span which can be operated through arc of 180 deg, 90 deg on each side of tracks; spans Norwalk river at South Norwalk, Conn. (see also Ry Elec Engr v 23 n 11 Nov 1932 p 265-6)
Electric eye alines movable bridge span
Ry Age
Railway Age ; 93
1932
Article (Journal)
English
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Electric eye alines movable bridge span
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