Popular Science, kesäkuu 1936
Color-blind motorists, ordinarily unable to tell a red traffic light from a green one, could drive in safety behind a windshield attachment proposed by Thomas Ross, of the University of Washington. Viewed through a screen made by punching holes in a sheet of red transparent material and inserting disks of green transparent material, the lights would take on polka-dot patterns. A green light would appear dark with bright spots, and a red light, bright with dark spots, permitting the two to be readily distinguished.
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