Notes on lectures, talks and scientific work by Edward Appleton and William Piggott, 25 November 1950 and no date

Notes on lectures, talks and scientific work. The material consists of 'Solar Radiation in the Radio Spectrum. Radiation from the Quiet Sun', 8 pages of typescript notes for a slide lecture by Edward Appleton, mainly on D.F. Martyn's research, no date, c. 1948; 'The Sun as an Emitter of Radio Waves', Royal Institution Friday evening discourse, dated 25 November 1950, an 3 page incomplete typescript draft and slide list.; manuscript notes, probably for short talks, 2 pages and 1 page; and manuscript notes by Edward Appleton and William Piggott on the work of others scientists (including [Fred] Hoyle, Ryle, J.S. Hey, etc.), perhaps taken at a conference or discussion meeting.