Maple & Co., London 1916 Military Heliograph Consign Now DeptCollections, Decorative ArtsSizeHeight 38 in. Maple & Co., London 1916 Military Heliograph, brass, glass, mirror on a wood tripod stand, Houghtons Ltd, London, 1912, used for instantaneous optical communication Height 38 in. Please note that this auction has ended. Click here for an overview of this auction.