Correspondence regarding the photographic zenith tube, including correspondence with Sir Howard Grubb, Parsons and Co. Ltd on modifications and adjustments. There are also the following papers:

A copy of the observing programme for 1965-1971, which also lists stars from the 1958-1964 programme, 1963.

Correspondence with foreign observatories regarding adopted places and the proper motion of the stars on the photographic zenith tube list, 1958. The correspondents include Dr P.J. Melchior, Brussels Observatory; Dr E.P. Fedorov, Russia; Dr J.P. Blazer, Neuchatel; Professor G. Cocchini, Italy; Professor A. Danjon, Paris; and Dr W. Markowitz, United States Naval Observatory.

Correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding contract C.P.Br. 4/96763/43 for the finalised price of £33,132-5s-0d for the 10-inch photographic zenith tube, 1956.

Correspondence regarding the loan to the Royal Greenwich Observatory of a photographic zenith tube plate measuring machine built by Sir Howard Grubb, Parsons and Co. Ltd for the photographic zenith tube at the Mount Stromlo Observatory, Australia, 1956.

Correspondence with Sir Howard Grubb, Parsons and Co. Ltd regarding the selling price of replicas of the photographic zenith tube and the payment of a sum of money to the Admiralty, 1955.