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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.;
3 occurrences of jefferson cyclopedia
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4468. LATITUDE AND LONGITUDE, Chronometers and.—
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3 occurrences of jefferson cyclopedia
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4468. LATITUDE AND LONGITUDE, Chronometers and.—

Fine time-keepers have
been invented, but not equal to what is requisite,
all of them deriving their motion from a
spring, and not from a pendulum. Indeed these
pursuits have lost much of their consequence
since the improvement of the lunar tables has
given the motion of the moon so accurately, as
to make that a foundation for estimating the
longitude by her relative position at a given moment
with the sun or fixed stars.—
To Captain Grove. Washington ed. v, 374.
(W. 1808)