The development of thermionic valves for naval uses

The first four sections of the paper describe the introduction of valves into naval wireless telegraph installations, and the early work, expe-imental and theoretical, on the elucidation of their observed behaviour. Section 5 deals with the principles of the numerical design of power valves, more particularly triodes, and with the rapid development of the manufacture of valves so designed. The three following sections, 6, 7, 8, deal with the investigation and improvement of small valves for use in reception, including both high-vacuum and gas-filled types. Successive stages of approximation in the calculation of the characteristics of small valves with low operating voltages are illustrated in section 9, the final result of calculation indicating the degree o1 closeness with which the observed behaviour of a high-vacuum valve can be accounted for in terms of known physical phenoména. The concluding section deals with the standardization of valves and their specification for quantity production.