Details of device for measuring time interval required for vehicle to travel predetermined fixed distance along highway; two parallel, horizontal light beams directed across roadway are focused onto two photoelectric tubes; when light beams are interrupted, tubes become non-conductive. (published Sept 1942)
New photo-electric speed recorder and its adaptation to two-way traffic counting
Wash State College -- Eng Experiment Station -- Bul
1941
12 pages
Report
English
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Automatic recorder for counting highway traffic
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