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The Jeffersonian cyclopedia;

a comprehensive collection of the views of Thomas Jefferson classified and arranged in alphabetical order under nine thousand titles relating to government, politics, law, education, political economy, finance, science, art, literature, religious freedom, morals, etc.;

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6538. PENDULUM, Experiments with.—
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6538. PENDULUM, Experiments with.—

I had taken no notice of the precaution of
making the experiment of the pendulum on
the sea-shore, because the highest mountain in
the United States would not add 1-5000 part to
the length of the earth's radius, nor 1-128 of an
inch to the length of the pendulum. The highest
part of the Andes, indeed, might add about
1-1000 to the earth's radius, and 1-25 of an
inch to the pendulum. As it has been thought
worth mention, I will insert it also.—
To David Rittenhouse. Washington ed. iii, 149.
(N.Y., 1790)