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Observing at the 18″ Schmidt telescope
Observing at the 48″ Schmidt telescope
Dome of the 100″ Hooker telescope at Mt. Wilson
George Abell preparing to take plate with 48″ Schmidt telescope
200″ Hale telescope pointing to zenith, seen from east
George Abell preparing to take plate with 48″ Schmidt telescope
60″ telescope, seen from the west
Sun near sunspot maximum, showing 23 spot groups
100″ Hooker telescope at Mt. Wilson
48″ Schmidt telescope
Rudolph Minkowski (right front) and Ira Bowen (right rear) inspect a pair of duplicate positive prints of the Sky Survey Atlas
200″ prime focus
200″ Hale telescope pointing to zenith; seen from the south
48″ Schmidt telescope
Prominences. Whole edge of sun taken with calcium K line
William C. Miller working at the Palomar 200″ coude spectrograph
Inspecting the 200″ mirror