This catalogue has been compiled by Peter Harper and Timothy E. Powell, National Cataloguing Unit for the Archives of Contemporary Scientists, University of Bath. NCUACS catalogue no. 133/6/04.

The collection includes biographical material, Jeffreys' research work, items relating to lectures given by Jeffreys and a small selection of material relating to societies and organisations Jeffreys was involved with. There is an extensive collection of published works and related material and also of Jeffreys correspondence. Also included is a large collection of photographs, reflecting Jeffreys interest in the medium.