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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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228. AGRICULTURE, Model plow.—
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228. AGRICULTURE, Model plow.—

shall with great pleasure attend to the construction
and transmission to the Society
[Agricultural Society of Paris] of a plow
with my mould board. This is the only part
of that useful instrument to which I have
paid any particular attention. But knowing
how much the perfection of the plough must
depend, 1st, on the line of traction; 2nd, on
the direction of the share; 3rd, on the angle
of the wing; 4th, on the form of the mould
board; and persuaded that I shall find the
three first advantages, eminently exemplified
in that which the Society sends me, I am anxious
to see combined with these a mould-board
of my form, in the hope it will still advance
the perfection of that machine.—
To M. Sylvestre. Washington ed. v, 313.
(W. 1808)