Letter from [Andrew] Noble, Elswick Works, Newcastle upon Tyne, to the Assistant Secretary of the Royal Society, London 'Dear Sir, I return herewith the proof duly corrected, and I do not think any further corrections are required. I shall be greatly obliged if you will tell me if I may proceed with the printig off of the plates, and how many copies have to be struck off? You returned a sample with the correct number - I assume there is no other correction required? Yours faithfully. A Noble'. 23 August 1906