Warner & Swasey Refracting Telescope

This is the first telescope made by Warner & Swasey, a machine tool firm in Cleveland, Ohio, that would later provide mounts for the 30-inch refractor at the Lick Observatory in California (1887), the 40-inch at the Yerkes Observatory in Wisconsin (1897), and many other notable instruments. It was installed at Beloit College in Wisconsin in 1881.
When the original 9½-inch objective lens (made by Alvan Clark & Sons) was placed in another instrument, the mount was returned to Warner & Swasey. It came to the Smithsonian in 1958.
This telescope has an equatorial mount. The declination circle is graduated to 15' and reads by vernier to 1'. The hour circle is graduated to minutes and reads to 5". The driving clock has a conical pendulum.
Currently on loan
Object Name
telescope, refractor
date made
Warner & Swasey Company
overall: 14 ft; 4.2672 m
place made
United States: Ohio, Cleveland
ID Number
catalog number
accession number
Science & Mathematics
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Warner & Swasey

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