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Enlarged photographs of the planet Mars

1909

Halley's Comet; E E Barnard

1910-05-04

Portion of the Moon (Theophilus, etc.) G.W. Richey with 40-inch Yerkes visual refractor, 1900, October 12

Portion of the Moon

1900

Portion of the Moon (rough crater region above Mare Nubium) G.W. Ritchey and by F.R. Sullivan, with 40-inch Yerkes visual refractor colour screen, and isochromatic plate, 1901, November 21, age about 10 1/2 days, term about -38[o]m., exposure, 1 sec.

Portion of the Moon; crater region above Mare Nubium

1901

Glass positive of:- Great Nebula in Andromeda (M.31.N.G.C.224,205,221). Ritchey and Pease, Yerkes. 24-inch Relflector 1901, September 18. 14"x17". Prepared from negative R.A.S. No.98

Glass positive of:- Great Nebula in Andromeda

1901

High level (H2) calcium vapour surrounding the Great Sun-spot of 1903, October 10, 9h. 9m. C. S.T. slit at 3968.6 Sun's diam. = .77 metre, taken with the Rumford spectroheliograph and 40-inch refractor of the Yerkes Observatory by G.E. Hale and F. Ellerman

High level (H2) calcium vapour surrounding the Great Sun-spot of 1903

1903

Glass positive 12" x 10":- globular star cluster in Pegasus. M.15.N.G.C. 7078. Enlarged from R.A.S. neg. no. 102. Ritchey and Sullivan, Yerkes Observatory, 1900, October 3

Glass positive 12" x 10":- globular star cluster in Pegasus. M.15.N.G.C. 7078.

1900

Portion of the Moon (Mare serenitatis and Mare tranquillitatis) G.W. Ritchey and F.R. Sullivan, with 40-inch Yerkes visual refractor, colour screen, and Isochromatic plate, 1901, August 3, age about 18 1/2 days, term, about 44[o] E., exposure, 1/2 sec.

Portion of the Moon (Mare serenitatis and Mare tranquillitatis) G.W. Ritchey and F.R. Sullivan

1901

Enlarged photographs of the planet Mars, E.E. Barnard, Yerkes Observatory, 1909, September 24th, 16h. 55m. G.M.T. 40-inch refractor, exposure, 4 sec, to 5 sec, Yellow colour screen

Enlarged photographs of the planet Mars

1909

Nebula in Andromeda; N.G.C. 224, 205, 221. R.A., Oh 36m. Decl., + 40 degrees 30'. G.W. Ritchey and F.G. Pease, Yerkes Observatory; 1901, September 18; 24-inch Reflector; Focal length, 93 in. Exposure, 4 hours

Nebula in Andromeda; N.G.C. 224

1901