Multi-electrode counting tubes

The paper considers possible uses of hot and cold cathode decimal counters in systems other than straightforward counting. It deals with their uses for adding and subtracting, for counting a predetermined number, and for dividing by numbers less than ten. The principles of a pulse-amplitude analyser using trochotrons and dekatrons in a matrix system are outlined. References are also made to other possible uses where they are expected to be more reliable than more conventional methods.