Bilder Videos

Troughton Bilder ❘ Science Photo Library

Elevation of Troughton's dividing engine, 18th century
12901544 - Elevation of Troughton's dividing engine, 18th century
Troughton transit circle,18th century
11602218 - Troughton transit circle,18th century
Troughton equatorial,19th century
11602215 - Troughton equatorial,19th century
Troughton Circle,19th century
11602214 - Troughton Circle,19th century
Troughton reflecting circle,19th century
11696978 - Troughton reflecting circle,19th century
Zenith sector telescopes
11879884 - Zenith sector telescopes
Groombridge's transit circle,1806
11879928 - Groombridge's transit circle,1806
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