Correspondence regarding the Yapp 36-inch Reflecting Telescope, including correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding the refiguring and polishing of the telescope's mirror. The papers also include the following items:

Correspondence regarding the contract for the purchase of an electric driving mechanism for the Yapp Reflecting Telescope, 1956.

Memorandum by R. Atkinson on shipping mirrors and other important items, 1956.

Graph from Sir Howard Grubb, Parsons and Co. Ltd showing the 36-inch paraboloid mirror before and after the work done on it, 1956.

Correspondence with Edwards High Vacuum Ltd regarding a 40-inch aluminising plant to be installed at Herstmonceux, 1954-1956, including three photographs: the general view of the chamber with the diffusion pump attached; the chamber with the mirror cell lying horizontally in front of it; and the chamber, together with the cell, in position prior to clamping the two sections together.

Drawing from Sir Howard Grubb, Parsons and Co. Ltd indicating sundry blemishes on the surface of the Yapp mirror, 1956.

Wave shearing interferogram No. 4962 of the Yapp mirror, 31 May 1956, prepared by Sir Howard Grubb, Parsons and Co. Ltd.

Wave front profile of the Yapp mirror prepared by Sir Howard Grubb, Parsons and Co. Ltd, 1956.

Copy of the specification of the aluminising plant for the Royal Greenwich Observatory, Herstmonceux, 14 July 1954.