Word: beam
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Called the "semagraph," Inventor Green's device is based upon use of the photo-electric cell. The special typewriter used in preparing copy prints a coded combination of dots under each character. Each group of dots interrupts a tiny beam of light in the semagraph, causing the proper type letter mold to fall into place...
Thou burning sun with golden beam...
...Nicol prism. Each of the two cells is surrounded by a coil of electric wire which becomes an electromagnet. The coils are so wound that the swings of the magnets are in opposite directions. To operate, the Allison device is so set that, with the magnets not working, the beam of light passing from the spark through the two cells and mirrors is at a minimum. Then, as the observer watches that minimum, he throws a current of electricity into the magnets. Their opposite fields wrench the light beam. The twisting follows the throwing of the switch by a time...
...derives its carrier wave from a high-intensity arc light. The carrier wave is modulated by the Alexanderson scanning device which translates a picture or scene into electricity (TIME, Jan. 23, 1928). As with the Taylor system, anyone who has the proper receiving apparatus and can see the Alexanderson beam, can also see what the television apparatus is seeing...
...local broadcasts either system might be used. But the Taylor neon tube system could be used by only one visible station at a time, because the receivers see every modulated beam of neon light striking them and would be hopelessly confused by two or more sending beacons...