1768700 Group portrait of seven men in military uniform, 1914-18 (b/w photo) by English Photographer, (20th century); The Royal Institution, London, UK; (add.info.: Most probably officers of the Royal Engineers Field Survey. Four are identified: Lieut G. A. Allingham, Equipment Officer (Back row L) and front row from L to R: Lieut-Col. Harold St John Winterbotham, Technical Assistant; Colonel Ewan Maclean Jack, Officer in Charge; Major William Lawrence Bragg, Sound-ranging Advisor. Bragg (31 March 1890 ??1 July 1971) won the Nobel Prize in physics in 1915 for his work on X-ray crystallography.); 穢 Royal Institution ; English, out of copyright.