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General: Experimental/Observational:
Observations on a Clock of Mr. John Shelton, Made at St. Helena
by Rev. Nevil Maskelyne
[Phil. Trans. R. S. L. 52, 434 (1761)]
The purpose of the experiment: to see whether a pendulum clock runs at
the same speed at all latitudes (and thus whether the force of gravity
depends on latitude).