Word: correctives
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Dates: during 1950-1959
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...rudimentary version of the machine, the student answers by manipulating printed figures or letters. His arrangement of the figures and letters is compared by the machine with the correct answer, in code. If machine answer and student answer are congruent, the machine automatically proceeds to the next frame. If they do not agree, the student's answer is blanked out and he must answer again; the machine will not proceed until the right answer has been set down...
...more subtle and complex model makes is possible for the student to compare his answers with the printed correct response which the machine shows to him. In this type the information is printed in thirty radial frames on a paper disk. The disk is inserted, and once locked inside cannot be removed for examination (or cheating) until all the answers have been completed. The portion of the frame in which the correct answer is written is concealed until the student writes his own answer on a paper strip, visible through another opening...
...Correct Answer Revealed...
...from 191 to 5.588, counting splits and stock dividends, while A.T. & T. has gone only from 165 to 200%. Harold Clayton of Hemphill, Noyes calculates that the average would now be at 1830, and other experts figure it at 910. All used different short-cut computations. To get the correct figure, it would be necessary to recompute the Dow-Jones average for every market day since 1939 -a task to challenge Univac...
...That's quite correct," answered...