Letter from [Alan Archibald Campbell] Swinton, to Colonel G. Thornhill, C. M. G., D. S. C., 61 Gracechurch Street, London, E. C. 2. Responding to a previous letter, offering a further explanation of Mihalyi's system of Television, raising new points he has identified: 1) retention of vision by the eye; 2) failure to give details of Mihalyi's new electrical amplifier; 3)the High Frequency Telephone Transmitter appears to be something like what is called Wired Wireless ; 4) does not understand what is said about the Wolfram Arc-Lamp. 5 January 1928