were interrupted by the First World War during which he served as a 2nd Lt in the Royal Garrison Artillery in France from 1915.
He later transferred to the Field Survey Battalion of the Royal Engineers (mapping) first as a Captain then as an Adjutant.
[4] After the war (1920) he gained a place as Assistant Director of the Physical Laboratory at Manchester.
The citation on his election to Fellowship of the Royal Society[1] in 1929 reads: "Before 1914 he carried out a series of researches into the nature of Beta-rays and other problems of radio activity.
Distinguished also by his recent work on the energies of X-ray levels, as deduced from the velocities of secondary corpuscular rays, on which important branch of atomic physics he has obtained world-wide recognition as one of the pioneers.