Copy letter from Robert William Frederick Harrison, to Dr John Hopkinson, Fellow of the Royal Society 'Dear Sir, I am sending to you herewith the duplicate copy of the text and illustrations of your paper "On the Capacity and Residual Charge of Dielectrics as affected by Temperature and Time" [not attached], which is in course of publication in the "Phil. Trans" ['Philosophical Transactions of the Royal Society'] I am, yours faithfully, Robt Harrison Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 11 February 1897