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Dollond refracting telescope, 1790-1810.

Dollond refracting telescope, 1790-1810.
4 0 c m
actual image size: 23cm x 32cm


This bras telescope was made by the London instrument makers Peter and George Dollond. It has a 2 3/4 inch lens and is carried on an equatorial mount of the type first introduced by the Sisons family of instrument makers. Used in conjunction with a table, the equatorial stand could be made horizontal using the three adjusting screws and the pair of spirit levels. Once adjusted, objects could be located using the circular setting scales. A telescope of this quality would only have been affordable to a wealthy individual with an interest in astronomy.

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© Science Museum / Science & Society Picture Library

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