Letter from J D Griffith Davies, Assistant Secretary of the Royal Society, on a paper 'Short period fluctuations in the characteristics of wireless echoes from the ionosphere' by Thomas Lydwell Eckersley and F T Farmer to the Astronomer Royal and reply Letter from the Assistant Secretary, asking if the recipient would like a copy of the paper for confidential use. Each copy costs two shillings. He would be glad to have the official order by the end of the week. Reply from the Astronomer Royal office (dated 10 April 1941), requesting one copy of the paper. [Published in Proceedings of the Royal Society A, 1945]. 7 April 1941