Word: scanners
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Dates: during 1930-1939
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...which have been selected for him. Last week at Northwestern University a young graduate student in psychology named Emil Ranseen demonstrated an invention by which a sightless reader patient enough to learn a touch code may read any book he chooses. After it is adjusted for proper spacing, a scanner supported on tiny rollers moves back & forth across the printed page examining one letter after another in rapid succession. The light passes through a lens, thence to a slotted, motor-driven disk which analyzes the shape of the letter. Then a photo-electric cell converts the light into electric current...
...transmitter, a photograph, drawing or message is scanned photoelectrically as in television. Lights and shadows are converted by the scanner into electric impulses, which, at the receiving end, control a stylus under which a roll of carbon-backed paper...