Reversible Decade Counting Circuit

Abstract
A ring‐of‐ten circuit is described, using ten pentodes, ten twin‐triodes, ten resistors, and no condensers, per ring. Two pairs of input terminals are provided for clockwise and counter‐clockwise feeding, respectively. This circuit can be used for electronic adding and subtracting, as well as for differential counting‐rate measurements on two sources. With the addition of five resistors to a ring, the number of counted events can be indicated on the screen of a small cathode‐ray tube. This circuit counts up to 5×105 evenly spaced events per second.

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