Publisher's Synopsis
Excerpt from Reduction of the Observations Made by Bradley at Kew and Wansted, to Determine the Quantities of Aberration and Nutation
The examination of the position of the fixed dot with respect to the plumbline was generally repeated after the observation. To avoid parallax in placing the fixed dot under the plumbline, a small lens of inch focal length was made to bear upon the plumbline.
It is clear from this description, that an alteration in the position of the brick work, on which the apparatus was fixed, could have no effect on the observation.
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