Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society to J Stuart Esq., Normal House, Queen Alexandra Road, North Shields 'Replying to your letter of the 12th instant, the paper you refer to by Monsieur P de Lange on the Thermophone will shortly be published in the Proceedings of the Royal Society, which may be obtained from Messrs Harrison & Sons, 46 St Martins Lane, London, WC, at the published price.' 14 January 1915