Copy letter from Robert William Frederick Harrison to Professor H [Hugh] L [Longbourne] Callendar, FRS, Chairman of the Physics and Chemistry Committee 'Draft minutes of the Physics and Chemistry Sectional Committee, March 15th 1910. Draft minutes of the meeting of the Physics and Chemistry Sectional Committee held on March 15th are enclosed for the Chairman's perusal. Will the Chairman please return them approved or amended and signed?' 17 March 1910