McDonald Observatory

McDonald Observatory

McDonald Observatory
Electric Power Sources 2
II: Buildings and Grounds
This one-third horsepower electric motor operates the perfectly balanced 75-ton telescope. An outstanding feature of the observatory is its declination-deviation control, which automatically compensates for the earth's rotation, allows for the bending of light rays striking the earth's atmosphere, and keeps the huge instrument constantly focused on stars in their flight through space.
Astronomical observatories | Science rooms and equipment | Motors
Payne, Elwood M.
Photographic prints; 24.3 x 19.1 cm
Davis Mountains, Texas
Archival Photographic Files
University of Chicago Library, Special Collections Research Center

View information about rights and permissions.

View information about ordering reproductions.