Correspondence between R. H. Stoy of the Royal Observatory at the Cape of Good Hope, South Africa and David Thomas of the Royal Greenwich Observatory at Herstmonceux. Comprises the following letters:
- David Thomas on his trip to Paris (report enclosed), conditions at the Cape and a fault with the Photographic Zenith Tube, 24 July 1963;
- R. H. Stoy on the design of an astrolabe pavillion, weather conditions at the Cape and a 'Bright star list', 5 August 1963;
- David Thomas on the construction of the astrolabe building and some preliminary Herstmonceux Astrolabe results, 16 September 1963;
- R. H. Stoy on the construction of the astrolabe building and the FK3 catalogue, 11 November 1963;
- David Thomas on the construction of the astrolabe building, 5 December 1963;
- R. H. Stoy on the construction of the astrolabe building, 18 December 1963;
- R. H. Stoy on the astrolabe building, 20 March 1964;
- David Thomas on Herstmonceux Astrolabe progress and results, the effect of temperature differences on the prism, suggested observing programme and the letting of his house, 23 March 1964;
- R. H. Stoy on the benefit of a five year programme over a two year one, and asking whether to acquire a Assmann hygrometer, 31 March 1964;
- David Thomas on the astrolabe building, 1 April 1964;
- R. H. Stoy on the astrolabe building plans and the bad observing season, 8 April 1964;
- R. H. Stoy on the astrolabe building, 23 April 1964;
- David Thomas on the construction of the astrolabe building, specifications of the pier to support the astrolabe and eletrical supplies for the building, 7 May 1964.