An Account of Experiments to Determine the Figure of the Earth by Means of the Pendulum Vibrating Seconds in Different Latitudes : As Well as on Various Other Subjects of Philosophical Inquiry (Cambridge Library Collection - Physical Sciences)

Sabine, Edward

Cambridge University Press（2014/02発売）

• 製本 Paperback:紙装版/ペーパーバック版／ページ数 538 p.
• 言語 ENG
• 商品コード 9781108062077
• DDC分類 526.1

Full Description

As early as the seventeenth century, scientists realised that a pendulum swings more slowly at the equator than it would at the North Pole. Newton predicted that gravity increased with latitude, and that the Earth could not be perfectly spherical. Although various experiments were undertaken to determine the exact degree of this ellipticity, none proved successful until physicist Edward Sabine (1788-1883) embarked on a series of expeditions across the world. Based on pendulum measurements from a wide range of latitudes, from Jamaica to Spitsbergen, his results were very different to mathematical predictions, and far more accurate; Charles Babbage would even complain that they were too good to be true. In this account, which first appeared in 1825, Sabine explains his methodology and presents his findings. His book opens a fascinating window into nineteenth-century geodesy for students in the history of science.

Contents

Preface; Experiments for determining the variation in the length of the seconds pendulum; I. With detached invariable pendulums; II. With attached invariable pendulums; Latitudes of the pendulum stations; Application of the observed variation in the length of the seconds pendulum to the determination of the figure of the earth; Geographical notices; Hydrographical notices; Experiments for determining the variation in the intensity of terrestrial magnetism; Atmospherical notices.