Copy letter from Robert William Frederick Harrison to Professor H [Hugh] L [Longbourne] Callendar FRS 'Paper by G W C Kaye on "A silica standard of length". This paper has been referred to Major MacMahon who considers it an interesting and carefully written paper. Sir Joseph Larmor is prepared to pass it for the Proceedings [of the Royal Society] if the Chairman concurs. Will the Chairman kindly minute his opinion.' 15 June 1911