Word: disks
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Dates: during 1950-1959
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Today's featherweight plastic contact lenses are invaluable to many nearsighted and farsighted people. But those who need bifocal correction still cannot use them. Reason: it is useless to place a reading prescription in the bottom of a contact lens because the tiny plastic disk, resting in a shallow bath of tears, rotates once or twice a minute...
When a teaching disk is inserted in the machine, a question appears in a slot. The student then writes his answer in the place provided. He pushes a lever and his answer slides up beneath a glass plate, so that changes cannot be made. At the same time, the correct answer is revealed in another slot. The process continues until all questions on the disk have been correctly answered...
Several students in the course have sought to complete the work more rapidly by managing to advance the disk on the machine so that the question and answer are revealed simultaneously. According to Skinner, an analysis of the series of punched holes on the answer sheet will show instructors when this has been done. "We're bringing out a new model next year that will eliminate all possibility of cheating," he added...
...market as stereo tapes, but the high cost of tape equipment and of the tape itself ($14.95 and up for the amount of music that goes for $3.98 or $4.98 on LPs) limits its sale. As an alternative, the industry concentrated its research on the development of a stereo disk that would sell for only a dollar or so more than the regular LP record...
When Columbia indicated that it might go the way of the compatible disk a month ago, the industry, flinching at the memory of the "Battle of the Speeds" in the late '40s, set up a protest. Columbia's compatible disk, other recordmakers argued, produced neither good monaural sound nor genuine stereo sound. Protesting its faith in its system, Columbia nonetheless fell into line. Chances are that the majors will be out by midsummer with a limited number of noncompatible stereo disks selected for their inherent sound qualities...