A stable ninety-nine channel pulse amplitude analyser for slow counting

1.1. It is often necessary in nuclear physics research to know the distribution in amplitude of a series of electrical impulses. An instrument which reveals this distribution directly is called a ‘pulse-amplitude analyser’, or, in the jargon of the late war, when the problem of building such an instrument was first seriously considered, a ‘kick sorter’. Many kick sorters have been described or discussed (( 1 )—( 16 )), and many new types are at present under development.