Letter from the Wireless Telegraphy Board, on a paper 'Short period fluctuations in the characteristics of wireless echoes from the ionosphere' by Thomas Lydwell Eckersley and F T Farmer to J D Griffith Davies, Assistant Secretary of the Royal Society and reply The Stationery Office are still unable to obtain a copy of the paper. Requests a direct copy with an invoice. The Royal Society replies with a copy of the paper. The paper is confidential, so he would be obliged if its receipt was acknowledged. [Published in Proceedings of the Royal Society A, 1945]. 28 August 1941