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.

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 ... Library Collection - Physical Sciences)

Sabine, Edward

History

Cambridge University Press

An Account of Experiments to Determine the Figure of the Earth

Gilbert, Daviesdte

BiblioLife

Narrative of an Expedition to the Polar Sea in the Years 1820, 1821, 1822 and 1823

Wrangel, Ferdinand Petrovich

Historical Study & Educational Resources

Nabu Press

Meteorological Essays

von, Humboldt Alexander

ARAGO, François

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Report On the Magnetic Isoclinal and Isodynamic Lines in the British Islands. from the 8Th Report, Brit. Assoc. for the Advancement of Science

Report On the Variations of the Magnetic Intensity Observed at Different Points of the Earth's Surface

Science & Math

Cosmos: Sketch of a Physical Description of the Universe, Volume 2

Astronomy & Space Science

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