Letter from Ernest Henry Starling, Institute of Physiology, University College, University of London, Gower Street, London, to [Dugald] Clerk He has been visited by De Lange and Baron de Linden who have recently exhibited a thermophone at the Royal Society. Starling thinks that this is an excellent invention. It is being trailled at HMS Vernon but the inventors are not allowed to be present. Asks if De Lange, who is known to Rayleigh and Strutt, might have an interview with Admiral Jackson. 17 May 1915