Copy letter from Robert William Frederick Harrison to S Cowper-Coles, Grosvenor Mansions, Victoria Street, SW 'Dear Sir, Soiree. The Soiree Exhibits Committee will be happy to received some specimens illustrative of your method of deposition of gold and copper, provided the exhibition does not involve much space. I enclose a schedule which kindly fill up with particulars of the exhibit.' 5 April 1909