Collection

Split-lens eyepiece micrometer

PART OF:
Refracting telescope with 5.9-inch aperture lens, brass tube and English type equatorial mounting and clockwork drive
Made:
1870-1874 in London
maker:
Troughton and Simms Limited
Split-lens eyepiece micrometer by Troughton and Simms acquired

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Split-lens eyepiece micrometer by Troughton and Simms acquired
Science Museum Group
© The Board of Trustees of the Science Museum

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:
glass and brass
Measurements:
Box (closed): 95 mm x 280 mm x 160 mm, 1.22 kg
type:
split-lens eyepiece micrometer and instrument component
credit:
Donated by the Royal Observatory, Greenwich

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