Description
15th July 1968
a period known as the 'Little Ice Age'
28th May 1913
Blackfriars Bridge
Repeating altitude azimuth circle Size:M: 60 x 45cm 15th July 1968A 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
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