Copy letter from Robert William Frederick Harrison to Messrs Henry Young & Sons, 13 South Castle Street, Liverpool 'REplying to your letter of February 12th, we are not able to give you the address of any member of the Ronalds family. It is possible you might get the information you seek from the Secretary of the Institution of Electrical Engineers, Victoria Embankment, WC, or from Sir William Preece, KCB, FRS, whose address is Penrhos, Carnarvon.' 14 February 1913