Crew and scientists for the solar eclipse expedition on board the dirigible USS Los Angeles. Left to right: Chester Burleigh Watts, astronomer, U.S. Naval Observatory; George Henry Peters, astronomer, U.S. Naval Observatory; Frank Bowers Littell, astronomer, U.S. Naval Observatory; Edwin Taylor Pollock, Superintendent of the U.S. Naval Observatory; Walter Leroy Richardson, chief photographer for the U.S. Bureau of Aeronautics; Alvin K. Peterson, chief photographer for the U.S. Navy; Watson Davis, Managing Editor, Science Service.