Short wave beam (SWB1) telegraph transmitter no. 7 (Dorchester) restored to approximate original (1927) configuration in c. 1970, made by Marconi's Wireless Telegraph Company, Chelmsford, 1927
Panel comprising no 1 power magnifier of short wave beam (SWB1) telegraph transmitter no. 7 (Dorchester) restored to approximate original (1927) configuration in c. 1970, made by Marconi's Wireless Telegraph Company, Chelmsford, Essex, England, 1927