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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4471. LATITUDE AND LONGITUDE, Magnetic needle.—
Among other projects
with which we begin to abound in America,
is one for finding the latitude by the variation
of the magnetic needle. The author supposes
two points, one near each pole, through the
northern of which pass all the magnetic meridians
of the northern hemisphere, and through
the southern those of the southern hemisphere.
He determines their present position and periodical
revolution.—
To B. Vaughan. Washington ed. ii, 166.
(P.
1787)
| The Jeffersonian cyclopedia; | |