Sydney Pressey talks about teaching machines. 1964

Here’s how Pressey described the machine, which he branded as the Automatic Teacher in his 1926 School and Society article:

The apparatus is about the size of an ordinary portable typewriter – though much simpler. …The person who is using the machine finds presented to him in a little window a typewritten or mimeographed question of the ordinary selective-answer type – for instance:


To help the poor debtors of England, James Oglethorpe founded the colony of (1) Connecticut, (2) Delaware, (3) Maryland, (4) Georgia.


To one side of the apparatus are four keys. Suppose now that the person taking the test considers Answer 4 to be the correct answer. He then presses Key 4 and so indicates his reply to the question. The pressing of the key operates to turn up a new question, to which the subject responds in the same fashion. The apparatus counts the number of his correct responses on a little counter to the back of the machine…. All the person taking the test has to do, then, is to read each question as it appears and press a key to indicate his answer. And the labor of the person giving and scoring the test is confined simply to slipping the test sheet into the device at the beginning (this is done exactly as one slips a sheet of paper into a typewriter), and noting on the counter the total score, after the subject has finished.


The above paragraph describes the operation of the apparatus if it is being used simply to test. If it is to be used also to teach then a little lever to the back is raised. This automatically shifts the mechanism so that a new question is not rolled up until the correct answer to the question to which the subject is responding is found. However, the counter counts all tries.


It should be emphasized that, for most purposes, this second set is by all odds the most valuable and interesting. With this second set the device is exceptionally valuable for testing, since it is possible for the subject to make more than one mistake on a question – a feature which is, so far as the writer knows, entirely unique and which appears decidedly to increase the significance of the score. However, in the way in which it functions at the same time as an ‘automatic teacher’ the device is still more unusual. It tells the subject at once when he makes a mistake (there is no waiting several days, until a corrected paper is returned, before he knows where he is right and where wrong). It keeps each question on which he makes an error before him until he finds the right answer; he must get the correct answer to each question before he can go on to the next. When he does give the right answer, the apparatus informs him immediately to that effect. If he runs the material through the little machine again, it measures for him his progress in mastery of the topics dealt with. In short the apparatus provides in very interesting ways for efficient learning.

A video from 1964 shows Pressey demonstrating his “teaching machine,” including the “reward dial” feature that could be set to dispense a candy once a certain number of correct answers were given.