The description of right lines and circles, upon which geometry is founded, belongs to mechanics. Geometry does not teach us to draw these lines, but requires them to be drawn.
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"Tact is the art of making a point without making an enemy."
"The attractive force of the earth acts to the greatest distance, and is observed in the fall of the moon, which is continually drawn towards the earth."
"Errors are not in the art but in the artificers."
"The particles of light are exceedingly small, and move with exceeding swiftness."
"The parts of all homogeneal hard bodies which fully touch one another, stick together with a very strong attraction."
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