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Refracting telescope, 1749-1783

IMAGE number
UIS5061945
Image title
Refracting telescope, 1749-1783
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Location
Science Museum, London, UK
Medium
object
Image description

Refracting telescope, 1749-1783. This small brass telescope was made in London by either Jonathan Sissons or his son, Jeremiah. The instrument has a 1 1/4 inch (32mm) lens and is carried on an equatorial mount of the Baker type first introduced by the Sissons. 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 and naked-eye sight. A telescope of this quality would only have been affordable to the wealthy amateur astronomer. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
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