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Meridian Circle

Meridian Circle

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Description
This instrument was installed in the new observatory at Vassar College in Poughkeepsie, New York, in 1865, and used by Maria Mitchell, her students, and successors. It is marked "Wm. J. Young Philadelphia, Pa." The telescope has a clear aperture of 4 inches, and a focal length of 5 feet. The circles at either end of the axis measure 30 inches in diameter. One is finely graduated to 3" of arc, and read by vernier; the other is used simply as a finder. Vassar College donated it to the Smithsonian in 1980, along with the observer's couch and the apparatus used to reverse the telescope.
D. J. Warner, "William J. Young: From Craft to Industry in a Skilled Trade," Pennsylvania History 52 (1985): 53-68.
Location
Currently not on view
Object Name
transit, astronomical
astronomical transit
axis, meridian circle
date made
ca 1865
maker
Young, William J.
place made
United States: Pennsylvania, Philadelphia
Physical Description
brass (overall material)
Measurements
overall: 26 in x 41 in x 60 in; 66.04 cm x 104.14 cm x 152.4 cm
ID Number
1980.0318.01A
accession number
1980.0318
catalog number
1980.0318.01A
Credit Line
Vassar College
subject
Astronomy
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Medicine and Science: Physical Sciences
Science & Mathematics
Data Source
National Museum of American History
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