. Electronic apparatus for biological research . Figure Clearly either valve goes through a cycle of operations for every two cycles of the driving pulse, and the circuit therefore 'counts down' on a scale of two. It is not difficult to see that the necessary drive conditions are met if A is fed from a tap on the anode load of one of the valves in another, similar, scale of two. In this manner, chains of Eccles-Jordan circuits can be made to count on the scale of two raised to any integral 647

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