Copy letter from Robert William Frederick Harrison to T [Thomas] Mather, Fellow of the Royal Society The new title for the paper by Mr Smith and Mather has been approved and is as follows: "Comparison of the Board of Trade ampere-standard Balance, with the Ayrton-Jones current weigher; with an appendix on the electromotive forces of standard calls". In accordance with Mather's request Harrison returns Trotter's letter of March 30th with reference to the altered title. 4 April 1908