This consists of a 24v Post Office telephone relay as a binary, 0-1 on-off switch) together with a few diodes which ‘read’ the inputs to the unit, pass these to the actuating coil of the relay, and thus control whether its output is ‘on’ or ‘off’ ( 0 or 1 ).

These memory units work, roughly, like the ‘RAM’ in one of today’s computers.

Eight of them represent  one bit each (or a total of one byte) of stored memory: the other two ‘cycle through’ the values of these memory bytes, changing them for each ‘trial’ of  the problem being considered until a combination is found which represents a logical solution to the particular combination of “AND”, “NOT”,  “INCLUSIVE-OR”, ”EXCLUSIVE-OR”, “IF-AND-ONLY-IF”, etc, which make up that problem (or until it has been found, by exhausting all the 256 possible “values” held as these 8 bits, that no solution exists).

This way of solving a problem in formal logic, by running through ‘collections of YES/NO values’ until one is found which satisfies the conditions which have been set, uses “brute force” rather than showing any kind of true intelligence.  But then, in 1957, “AI” belonged in any case to science fiction.