Letter and copy of letter from Alfred Charles Glyn Egerton, on a paper 'Short period fluctuations in the characteristics of wireless echoes from the ionosphere' by Thomas Lydwell Eckersley and F T Farmer to C S Wright In spite of the opinion of the Ministry or Aircraft Production, there is still some doubt as to whether it is safe to publish the paper at this time. The Ministry claimed that all the technique in the paper is well-known, but it is unknown if it is well-known outside Britain. An Admiralty opinion should be sought [Published in Proceedings of the Royal Society A, 1945]. 12 November 1940