|Alternative reference number
|Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to P. J. Ridson Esq.; 30 Wilbury Villas, Hove, Sussex
|10 October 1923
|In reply to P. J. Ridson's enquiry, refers Ridson to the following books: Sommerfeldt's 'Atomic Structure' or [James Hopwood] Jeans' 'The Dynamical Theory of Gases'.