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Radio equipment comprising:- one-valve, home-constructed self-excited transmitter
Photograph of the instruments used by the British expedition when observing the 1919 total solar eclipse in Brazil.
General Electric CA101 Pilotron triode (McVitie Weston valve collection), 1918
Cossor Wurncell W.1 output triode valve (McVitie Weston valve collection), 1923