Correspondence with the Admiralty concerning the acceptance of Sir H. Thompson's offer of a 26-inch reflecting telescope for £5000, 1894.

Correspondence with Sir H. Thompson concerning alterations to the 26-inch reflector and its transfer to the Royal Observatory, 1893-1899.

Copies of correspondence between Sir Howard Grubb and A.A. Common concerning alterations and tests relating to the 26-inch reflector, 1895-1899.

Correspondence with Troughton and Simms concerning the delivery of a set of scales, divided according to instructions from the Astronomer Royal, 1894-1898.

Correspondence with M. Henry, 1894.

Correspondence with F. McClean on the Thompson Equatorial, 1898.

Correspondence with 'The Times', 1897, including a copy of an article titled 'The New Telescope at Greenwich', 15 April 1897.

Various memoranda, 1897-1899:

1. Scales for the Thompson Equatorial

2. The Thompson Equatorial (1899)

3. Thompson Equatorial (1897).

4. Thompson Equatorial - comparison of controlling pendulum (1897).

5. 26-inch photographic object glass.

6. Thompson photo-equatorial.

7. Thompson Equatorial - measurement of the diameter of photographs of stars taken with the 26 inch.

8. 30-inch Cassegrain Reflector.

9. Thompson Equatorial - Cassegrain Reflector.

10. Photographic Spectroscope.

11. Thompson Equatorial - photographic equatorial.

12. Rough sketch of differential of the Thompson 26-inch driving clock.

13. Dewcap of 26-inch equatorial.

14. Rough sketch of the proposed adaptor for holding dark slides, prism, etc. on the 30-inch reflector.