Thermionic Valve and Its Developments in Radio-Telegraphy and Telephony

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Some agreement on this question of nomenclature seems desirable if only to prevent the too exuberant growth of strange words which are merely trade names for modifications of generically similar devices. The author submits, there fore, this suggestion' tentatively to the radio-engineering fraternity.