View of the 'Oxford heliometer' , 1849.
3 1 c m
40cm
actual image size: 32cm x 23cm

View of the 'Oxford heliometer' , 1849.

© Science Museum / Science & Society Picture Library

Description

View of the 'Oxford heliometer' displayed at the Science Museum shown from the east side. This is a 7 inch refracting telescope with split-lens micrometer on a German equatorial mounting. It was built for the Radcliffe Observatory, Oxford by the company of A & G Repsold of Hamburg with optics by G Merz & Sons of Munich and was completed in 1849. The instrument was used to measure the parallax (a minute angular measurement) of nearby stars which is an indicator of their distance.
 

Image Ref.

10262199
 

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