Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Hugh Longbourne] Callendar, FRS Informs Prof. [Hugh Longbourne] Callendar to expect permission to reproduce in his article for Encyclopaedia Britannica, figures from his papers published in 1891 and 1902 in Transactions. [The papers in question are 'IV. On the determination of the boiling-point of sulphur, and on a method of standardising platinum resistance thermometers by reference to it.' and 'II. Continuous electrical calorimetry' respectively.] 5 November 1928