Some members of the British Association for the Advancement of Science, Section A (Physics)
Front row: O.J. Lodge, P. Langevin (France), J.C. McLennan (Canada), N. Bohr (Denmark), F.W. Aston, and P. Ehrenfest (Netherlands).
Back row: F.A. Lindemann, D. Coster (Netherlands), C.G. Darwin, R.T. Glazebrook, R.W. Wood (USA), R.H. Fowler, H.A. Kramers (Netherlands), and A.O. Rankine