Glass positive:- annular Nebula in Lyra, N.G.C.6720, R.A., 18h 48m decl, +32 degrees 51', J.S. Plaskett, Dominion Astrophysical Observatory, Victoria, B.C., 72-inch reflector, focal length, 30ft exposure, 25 min, 8" x 10"
Glass positive:- annular Nebula in Lyra, N.G.C.6720, R.A., 18h 48m decl, +32 degrees 51', J.S. Plaskett, Dominion Astrophysical Observatory, Victoria, B.C., 72-inch reflector, focal length, 30ft exposure, 25 min, 8" x 10"
