Copy letter from Robert William Frederick Harrison, to Alexander Siemens 'Dear Sir, I believe Mr Preece has already spoken to you with reference to your kind offer of an exhibit for the forthcoming Soiree here, and I am further desired by the Secretaries to express their thanks to you for your proposal and their regret that it came too late for them to find room for your demonstration on this occasion. I am, yours faithfully, Robt Harrison Asst. Sec R.S. [Assistant Secretary, Royal Society]'. 4 May 1896