Traffic and toll-collection use of photoelectric cells on new international bridge at Detroit; at different points on bridge approaches, photo cells indicate and register movement of cars; compared with former ticket-collection methods, this photo-cell plan has eliminated 20 men from operating payroll; details of system. (See also Electronics vol. 1, no. 3, June 1930 pp. 114-116, 6 figs.)
Photo cells control Detroit bridge traffic
Eng. News Rec
Engineering News-Record ; 104 , n 24
1930
2 pages
3 Figs.
Aufsatz (Zeitschrift)
Englisch
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Photo cells control Detroit bridge traffic
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