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SEAL.

District of Pennsylvania, to wit:

BE IT REMEMBERED, that on the twenty-second day of November, in the thirty-fourth year of the independence of the United States of America, A. D. 1809, Hopkins and

Earle, of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit: “ A Plain Elementary and Practical System of Natural Experi.

mental Philosophy; including Astronomy and Chronology. By the late Rev. John Ewing, D. D. Provost of the University of Pennsylvania. Being the Course of Lectures delivered by him in that Seminary,(Enlarged and Improved from time to time,) for upwards of twenty years. Illustrated by Copperplate Engravings. The whole carefully Revised and prepared for the Press, with sundry Explanatory and Supplementary Notes; By Robert Patterson, Professor of Mathematics in the said

University. With a Biographical Sketch of the Author.”
In conformity to the act of the Congress of the United States, inti.
tuled, “ An act for the encouragement of learning, by securing the co-
pies of maps, charts, and books, to the authors and proprietors of such
copies during the times therein mentioned.” And also to the act, enti-
tled “ An act supplementary to an act, entitled 'An act for the en-
couragement of learning, by securing the copies of maps, charts, and
books, to the authors and proprietors of such copies during the time
therein mentioned,' and extending the benefits thereof to the arts of
designing, engraving, and etching historical and other prints.”

D. CALDWELL,
Clerk of the District of Pennsylvania.

CONTENTS.

Page

1

The Lever

The Pulley

The Wheel and Axle

The Inclined Plane and Wedge

The Screw

Of Compound Machines

Of Friction

Equable Motion

Accelerated Motion of Bodies descending by Gravity, in

vacuo

Motion of Bodies in a resisting Medium

of Bodies on Inclined Planes

of Pendulums

of Projectiles

of Bodies round a Center

89

92

93

95

96

97

99

101

102

103

104

107

111

115

119

129

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