Split-lens eyepiece micrometer by Troughton and Si

Made:
1870-1874
maker:
Troughton and Simms Limited

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Split-lens eyepiece micrometer by Troughton and Simms acquired for the 1874 transit of Venus and used in Egypt with (Smyth) refracting telescope by Dollond mounted on English type equatorial mounting. It was used by by Captain Browne at Mokattan near Cairo in Egypt with the Smyth telescope to measure the position of Venus during the transit as the planet moved across the Sun in 1874.

Details

Category:
Astronomy
Object Number:
1929-949 Pt6
Materials:
brass, glass
Measurements:
Box (open): 65 mm x 280 mm x 320 mm, 1.22 kg
Box (closed): 95 mm x 280 mm x 160 mm, 1.22 kg
type:
split-lens eyepiece micrometer
taxonomy:
  • component - object
  • furnishing and equipment
  • measuring device - instrument
  • micrometer - angle
  • double image micrometer
credit:
Donated by the Royal Observatory, Greenwich

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