Copy letter from Robert William Frederick Harrison to Sir David Gill KCB, FRS 'Paper by H R A Mallock FRS on "Pendulum clocks and their evans". the Secretaries would be much obliged if Sir David Gill will give his advice, as a Member of Council, as to the publication of this paper in the "Proceedings [of the Royal Society]". The paper is enclose, together with a report on it by Prof E T Whittaker FRS.' [no enclosure] 29 June 1911