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Oxford Heliometer, with observer's desk, chair and stool

Oxford Heliometer, with observer's desk, chair and stool

1840-1848
Divided object-glass micrometer by George Dollond

Divided object-glass micrometer by George Dollond

1821-1857
Cassegrain reflecting Telescope of 2 1/2-inch aperture

Cassegrain reflecting Telescope of 2 1/2-inch aperture

1756-1758
Double-image object glass micrometer by Dollond, engraved Dollond, London with mahogany case.

Double-image object glass micrometer by Dollond

1754-1770
One of nineteen photographs taken at the Royal Observatory, Cape of Good Hope, South Africa, showing the dome and building for the 7-inch Heliometer by Messrs Repsold and Sons, Hamburg. Used widely by Sir David Gill to make stellar parallax measurements from 1887 onwards.

One of nineteen photographs taken at the Royal Observatory

1909