Herschel's 40-foot telescope, 1829

Herschel's 40-foot telescope, 1829

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Caption: Herschel's 40-foot telescope, with a diagram of its position micrometer (upper right) by Edward Nairne (1726-1806). Designed by the British astronomer William Herschel (1738-1822), this telescope was located at Observatory House in Slough, England. Observations began on 28 August 1789, and the telescope was demolished in 1839. It was moved by an assistant in the hut (lower left), with observations made from the platform at the front of the telescope, looking down its tube. This diagram is from 'An Introduction to Practical Astronomy', published by William Pearson in several volumes between 1824 and 1829.

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