Method and apparatus for building up and reducing the pressure of gases in ionography imaging chambers

Abstract From the Canadian patent

The interelectrode gap of an ionography imaging chamber is connected with a variable-volume container which is filled with a high Z gas at atmospheric pressure, and with first and second accumulators which respectively contain high Z gas at a higher and lower superatmospheric pressure. A timer circuit actuates valves in the conduits between the chamber on the one hand and the container and accumulators on the other hand in a given sequence so that when, the pressure of high Z gas in the gap is to be raised to an operating pressure which exceeds the aforementioned higher pressure the circuit, opens a first valve which allows gas to flow from the second accumulator into the chamber and …