Notes
a. ^ At the time, part of the Viceroyalty of Peru. Contemporary sources therefore refer to the 'Peruvian Expedition'.
b. ^ Mason, together with Jeremiah Dixon, had earlier marked the Mason-Dixon line which separated the northern and southern United States.
c. ^ These constructions are now ruined, but their remnants may still be found on the mountainside.
d. ^ This was arguably a rediscovery: Edmond Halley had plotted lines of equal magnetic variation (isogons) in 1701, and Nicholas Cruquius lines of equal depth (isobaths) in 1727.
e. ^ A value of 5,480 kg·m−3 appears in Cavendish's paper. He had however made an arithmetical error: his measurements actually led to a value of 5,448 kg·m−3; a discrepancy that was not found until 1821 by Francis Baily.
f. ^ Taking the volume of the Earth to be 1.0832 × 1012 km3.
Read more about this topic: Schiehallion Experiment
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