Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society 'Dear Professor Ayrton, Referring to your note of April 26th mentioning Mr Duddell's new form of Galvanometer for Exhibition at the Soirée, I regret to say there is now no space available. You might, however, like to bear it in mind as a suggestion to the Committee, when they are arranging for the June Soirée. Believe me, very truly yours, Robt [Robert] Harrison Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 2 May 1904