Papers concerning the installation of the 36-inch Yapp Reflector at Greenwich, including the following material:

(1) Miscellaneous material

Undated scroll containing the proposed inscription for the new Yapp Telescope.

Envelope of photographs of the 36-inch reflector at Edinburgh, showing the telescope observing carriage and grating, 1931.

(2) Correspondence with Hutchinson and Cuff, solicitors, and William Johnston Yapp regarding the 36-inch reflector, 1931-1934.

(3) Official correspondence with Admiralty

Correspondence with the Admiralty regarding the acceptance of W.J. Yapp's offer to present the Royal Observatory with a sum of money sufficient to purchase and install a new 36-inch reflecting telescope, 1931.

Correspondence with Mr Moorby, Civil Engineer-in-Chief, regarding the estimated cost of housing the new telescope, 1931.

Correspondence regarding a building for the telescope, 1931.

Terms and conditions for the building of the Yapp Reflector, 1931.

Progress report on the 'Greenwich 36-inch Reflector', 10 November 1931.

Duplicate order form for the Yapp Reflecting Telescope and dome, sent to Sir Howard Grubb, Parsons and Co Ltd, 1931.

Memorandum on electrical work required in connection with the Yapp Reflector, 1932.

Memorandum regarding a slit-less spectroscope and the terms and conditions of the contract for the spectroscope, 1932.

Correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding an account for £1,836 0s 0d for the second instalment of 20% of the contract for the Yapp Telescope, 1932.

Accounts from Sir Howard Grubb, Parsons and Co. Ltd relating to instalment payments for the Yapp Telescope, 1933-1934.

(4) Correspondence with Sir Howard Grubb, Parsons and Co. Ltd

Specification and quotation from Sir Howard Grubb, Parsons and Co. Ltd for a 36-inch Cassegrain reflecting telescope and for a dome of 30-feet outside diameter, 1931.

Specification No. 1 for a reflecting telescope with a 36-inch aperture, 1931.

Correspondence between Sir Frank Dyson and C. Young of Sir Howard Grubb, Parsons and Co. Ltd regarding the Yapp Reflector, 1931.

Progress report by C. Young on the reflector, 10 November 1931.

Correspondence between Sir Frank Dyson and C. Young regarding the Yapp Reflector, 1932.

Progress report from the company, 30 April 1932.

List of dome drawings from the company, 1932.

Progress report by C. Davidson, 15 June 1932.

Sketch of the Yapp Reflector at Greenwich showing alternative methods of supporting the crosshead during silvering, 1933.

Correspondence between Sir Frank Dyson and Sir Howard Grubb, Parsons and Co. Ltd regarding the reflector, 1933.

Report by C. Davidson on the inspection of the Yapp Telescope on 8 September 1933.

Correspondence between Sir Howard Grubb, Parsons and Co. Ltd. and Sir Harold Spencer Jones regarding the Yapp Telescope, 1934.

Correspondence between Sir Howard Grubb, Parsons and Co. Ltd and H. Spencer Jones regarding the Yapp Telescope and the evaporation qualities of certain metals, 1936-1937.

Correspondence regarding the slit spectrograph, 1936-1937.

Correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding the Cassegrain mirror for the telescope, 1936-1937.

Correspondence with C. Young regarding the formula for the hyperbola and its application to the Cassegrain mirror, 1936-1937.

Correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding repairs to the Yapp Telescope, 1938-1939.

Correspondence between Sir Howard Grubb, Parsons and Co. Ltd and R. Atkinson regarding a scheme for operating the declination slow motion, 1939.

(5) Correspondence with the press

Correspondence between 'Photopress Limited' and Sir Frank Dyson regarding photographing the new Yapp Telescope, 1932.

Correspondence with the Director of 'La Science and La Vie' of Paris regarding the Yapp Telescope, 1933.

Correspondence with the editor of the 'Keystone Press Agency' and with the art editor of 'The Times' regarding photographing the telescope, 1933.

Correspondence with the editor of 'The Sphere' regarding photographing the Yapp Reflector, 1934.

Report giving details of the reflector, 1934.

Correspondence with the editor of 'The Engineer' regarding the reflector, 1934.

Correspondence with the news editor of 'The Evening Standard' regarding the Yapp Telescope, 1934.

Telegram from the Cape Observatory, 1934, sending greetings to the Greenwich Observatory on the occasion of the official opening of the Yapp Telescope.

(6) Correspondence with Sir Richard Paget and Dr W.S. Adams regarding the use of a fused quartz mirror for the 36-inch Yapp Reflector, 1931.

(7) Miscellaneous correspondence regarding the Yapp Telescope

Article from 'Engineering' regarding the 40-foot revolving dome for the Stockholm Observatory, 1931.

Page from a calendar showing a photograph of the 36-inch aperture reflecting telescope manufactured by Sir Howard Grubb, Parsons and Co. Ltd, 1931.

Set of six photographs showing the stages in building the foundations for the dome of the Yapp Reflector, 1932.

Correspondence with the Synchronome Company Limited regarding a synchronome pendulum for the controlling the clockwork of the Yapp Telescope, 1933.