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ter; nor will they, perhaps, fully understand the truths it contains, till they see their relation to practice pointed out in the second. He found, that without becoming exceedingly prolix, there was no avoiding the use of some mathematical terms, but of these he has given definitions, either as the terms themselves occur, or at the conclusion of the Essay*.

*This Preface was written several years before the translation of Camus was published.

1 Union Place, Glasgow,
February, 1807.

B

GENERAL DEFINITIONS.

I.

WHEN two toothed wheels act upon one another, the greater is called the Wheel, and the lesser the Pinion.

II.

Instead of the pinion, the trundle is sometimes used, such as is here repre'sented. It is likewise known by the names of lantern and wallower.

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