Copy letter from Herbert Rix, to M Walter Brown, Secretary, Federated Institution of Mining Engineers, Newcastle-upon-Tyne 'Dear Sir, In answer to your letter of May 18th., we are sending you shortly a copy of Prof. [Professor Arthur William] Rucker's paper "Phil. Trans" ['Philosophical Transactions of the Royal Society'] A 55. Yours faithfully, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 31 July 1894