Correspondence between Louis Essen and the Royal Society Minor correspondence on Essen's election and admission to the Royal Society. Letters to the Secretaries, and to and from the Assistant Secretary, David Christie Martin and the Librarian, Igor Kaye. The original file featured the typed name and address: 'Dr. L. Essen, O.B.E., F.R.S., The National Physical Laboratory, Teddington, Middlesex'. 24 March-6 April 1960