Copy letter from Robert William Frederick Harrison to Messrs Longman's Green & Co 'With reference to your letter of Dec 19 enclosing a list of figures which it is desired to reproduce in a book by Sir William Abney, will you send a clerk round with prints of the original (and any other means of identification which is convenient); as we are unable, from the information you give, to identify all the figures in the list. A convenient time will be from two until five o'clock, any afternoon except Thursday (tomorrow).' 3 January 1912