| 摘要 |
A teaching machine is provided for use with question and answer sheets wherein the correct answers appear to be randomly spaced on the sheet. A cursor moves over a ruler and a student presses the button when he believes he has the right answer. An indicator such as green or red lights indicate whether a right or wrong answer has been obtained and means are provided on both the cursor and the ruler so that the connections are reversed from column to column and from line to line so that the student does not learn any set pattern as to where the correct response will be on the machine. A relay may be provided so that after the button is depressed the light will remain lit until the cursor or ruler is moved. A novel rack and pinion arrangement maintains the ruler in a parallel relationship with the answer sheet.
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