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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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8121. STANDARD (Weights), Basis.—
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8121. STANDARD (Weights), Basis.—

Let it be established that an ounce is of the
weight of a cube of rain water of one-tenth
of a foot; or, rather, that it is the thousandth
part of the weight of a cubic foot of rain
water, weighed in the standard temperature;
that the series of weights of the United States
shall consist of pounds, ounces, pennyweights
and grains; whereof 24 grains shall be one
pennyweight; 18 pennyweights one ounce; 16
ounces one pound.—
Coinage, Weights and Measures Report. Washington ed. vii, 487.