Scope and Contents Notes from lectures by W.R. Piggott. The material consists of a hardcover springback folder containing 75 pages, plus a 3 page appendix typescript account with lists of references and contents, beginning 'The following appendix consists fundamentally of notes taken by myself at a series of lectures delivered by Mr. W.R. Piggott of D.S.I.R. [Department of Scientific and Industrial Research] in October 1944'. The account is not signed, and there are manuscript corrections in more than one...

Scope and Contents 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...

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'Notes on oscillations in the atmosphere', by W.R. Piggott, dated 1952.

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Original folder inscribed, in Mrs Pritchard's hand, ‘Midnight Heights F₂ Layer'. The material consists of Tables and charts prepared by Mrs Pritchard for various dates and stations. Also included is a letter from W.R. Piggott enclosing data, 1953.

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The material consists of a report P. Lejay: Study of the ionosphere at Shanghai, translated from the French in English and with comments by WJG Beynon and WR Piggott, dated 1940.

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Papers relating to CX/WP 54.The material mainly refers to papers on 'Ionospheric Absorption Measurements' and 'Suggestions for an Absorption Programme' received by the Combined Communications Board Wave Propagation Committee and discussed at its meeting on 16 May 1945. Also Included are 4 pp. manuscript comments by William Roy Piggott on the CX/WP 54 papers, on behalf of Radio Research Board.

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The material consists of reports by W.R.Piggott, dated 1950 relating to ionospheric work at various U.S. centres: Harvard, Stanford, and the Carnegie Institute.

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'Storm phenomena and the solar cycle variations of the noon F₂ layer ionisation'. The material consists of a 10 page typescript draft, an early version of the paper by Appleton and Piggott published in Physics of the Ionosphere, 1954, with a manuscript note by Piggott, 'original draft replaced by now'.

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The material consists of file created by Edward Appleton entitled ‘Storms D(fF₂)/Q(fF₂) and O/W type curves’. It contains extensive data and graphs by William Piggott, Mrs. Pritchard and others, dated mainly 1945-1952 and it Includes a graph of sunspot cycle variation, by Piggott, dated 1935-1948.

Scope and Contents 'The application of ionospheric data to radio communication problems III'. The material consists of two versions of a paper with this title: a first version containing the names of Edward Appleton, W.J.G. Beynon and W.R. Piggott, and consists of 'Part (I) Theoretical', 22 pages typescript, no date; and a second version with the names of Appleton and Beynon only and contains part (I) (with some manuscript amendments) and also 'Part (2) Some experimental results and their application', no...