Letter from [Alfred Charles] Egerton to Sir [Frank Edward] Smith, regarding a paper 'On optical pyrometry II' by [Frank Allen] Cunnold, [Matthew] Milford, and Egerton Paper reference code: A.119 Explains the rationale behind the paper, as well as the reason for submitting it for the Proceedings [of the Royal Society]. Is prepared to make amendments to the paper, and suggests it be edited rather than withdrawn. Attaches response to the referee's comments. [Not published but part I published in Proc. A. vol. 130, issue 812]. Received 3 October 1938 29 September 1938