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“To demonstrate the exactness of the instrument”: Mountainside Trials of Precision in Scotland, 1774

Published online by Cambridge University Press:  01 September 2009

Nicky Reeves
Nicky Reeves*
Affiliation:
History and Philosophy of Science, University of Cambridge
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Argument

The British Astronomer Royal, Nevil Maskelyne, spent four months on a Scottish mountainside in 1774, making observations of zenith stars and coordinating a detailed survey of the size and shape of the mountain Schiehallion, in order to demonstrate and quantify what was known as “the attraction of mountains.” His endeavors were celebrated in London, where it was stated that he had given proof of the universality of Newtonian gravitation and allowed for a calculation of the relative densities of the earth as a whole and the earth near its surface. This paper argues that the “Schiehallion Experiment” was as much a trial of the precision of Maskelyne's instruments and their expert management as it was a trial of Newtonian theory. By tracing the biography of the key instrument used by Maskelyne, his zenith sector, we see how much personal credibility was a stake for him in Scotland. By considering the mountainside as a place to test and reveal the precision of astronomical instruments we see a link between the Scottish endeavors and Maskelyne's ambitions for the Greenwich Observatory.

Type
Research Article
Information
Science in Context , Volume 22 , Issue 3 , September 2009 , pp. 323 - 340
Copyright
Copyright © Cambridge University Press 2009

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