An equatorial room, in astronomical observatories, is the room which contains an equatorial mounted telescope. It is usually referred to in observatory buildings that contain more than one type of instrument: for example buildings with an "equatorial room" containing an equatorial telescope and a "transit room" containing a transit telescope. Equatorial rooms tend to be large circular rooms to accommodate all the range of motion of a long telescope on an equatorial mount and are usually topped with a dome to keep out the weather.
In some cases an observatory would move to a new location, or the equatorial telescope itself would be removed. The space would then be converted, for example, into use as a classroom or library. These peculiar rooms can sometimes be found in buildings at old colleges and towns, with their former use long forgotten.
- "Nature" Nov 19, 1885, page 57, By University of Wisconsin--Madison. Libraries
- Introduction To Orwell Park Observatory" by James Appleton
- A Handbook of Descriptive and Practical Astronomy, by George Frederick Chambers, page 198 - The Equatorial Room
- "Nature" Nov 19, 1885, page 57, "Detail of the Structure of the Observatory", By University of Wisconsin--Madison. Libraries
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