Copy letter from Robert William Frederick Harrison, to George Frederick Charles Searle, 20 Trumpington Street, Cambridge 'Dear Sir, In reply to your postcard, I think there can be no doubt that the steel rule in my hands must belong to you, as it corresponds with your description, and I therefore send it to you by post. I am, Dear Sir, faithfully yours, Robt [Robert] Harrison Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 21 March 1904