Repeating altitude azimuth circle Edward Troughton
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Repeating altitude azimuth circle
A repeating altitude azimuth circle manufactured by Edward Troughton. The 'altazimuth' circle was used to mount a telescope, permitting it to rotate along the vertical (altitude) and horizontal (azimuth) axes to aid the mapping of the stars.
19th century
- Image reference: RS-8464
- The Royal Society
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