English: Delegates to the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory Ellerman, H.C. Wilson, St. John, Larkin, Townley, V.M. Slipher, Fowle, Coblentz, Frost, Idrac, Puiseux, Hartman, Kustner, Slocum, Hamy, Knight, Wolfer, Fath, Rydberg, Hepperger, Fox, Haussmann, Cortie, Turner, Russell, Kayser, Adams, Miller, Ames, Backlund, Konen, Pickering, Fowler, Lampland, Hale, Belopolsky, Deslandres, Schuster, Campbell, Ricco, Mrs. Kapteyn, Bosler, K. Schwarzschild, Mc Adue, Kapteyn, Mrs. Fleming, Watson, Schlesinger, Humphreys, Madrill, J.F. Sanford, Chretien, De La Baume Pluvinel, Fabry, Abbot, Hills, Larmor, Cotton, Dyson, Barnard, King, Newall, Pringsheim, Leuschner, J.S. Plaskett, Gale, Chant, Eversheim, Rotch, W. Mitchell, Stratton, H.D. Babcock, Ritchey, Brackett. Identification key available upon request.Photo appeared in the book 'Explorer of the Universe' by Helen Wright, American Institute of Physics, 1994.