Correspondence concerning the Cookson Floating Zenith Telescope, including the following items:

Correspondence regarding the transfer of the Cookson measuring micrometer L13.302/31208 from the Meridian Department to the Astrometry and Astrophysics Department, 1952.

Correspondence regarding the proposed dismantling of the Cookson Floating Telescope and its return to the Cambridge Observatory, 1951.

Copy of corrections to the 'Boss General Catalogue' 1950, with related correspondence between H. Spencer Jones and D. Brouwer of the Yale University Observatory, 1945.

Correspondence with Professor N.K. Adam regarding anomalous results obtained with the Cookson Floating Zenith Telescope at the Royal Greenwich Observatory, 1943-1944.

Correspondence with Allan Ferguson regarding the Cookson Floating Zenith Telescope, 1943.

Correspondence with Dr C.H. Desch regarding whether there is any tendency for interaction between mercury and chromium, 1943.

Copy of a letter from H. Spencer Jones to E.G. Barton regarding observations of the sensitive bubble on the Cookson Floating Zenith Telescope, 1943.

Correspondence with Professor Benjamin Boss of Dudley Observatory, U.S.A., regarding the Cookson Floating Zenith Telescope, 1936-1937.