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MECHANICS,

OF
THEORETICAE, PRACTICAL,

AND

DESCRIPTIVE.

BY OLINTHUS GREGORY, LL.D.

OF THE ROYAL MILITARY ACADEMY, WOOLWICH;
UONORARY MEMBER OF THE PHILOSOPHICAL SOCIETIES OF LONDON AND

NEWCASTLE UPON-TYNE,
AND OF THE NEWCASTLE ANTIQUARIAN SOCIETY.

THE THIRD EDITION,

CORRECTED AND IMPROVED

VOL. II.

CONTAINING

REMARKS ON THE NATURE, CONSTRUCTION, AND SIMPLIFICATION OF MACHINERY, ON FRICTION, RIGIDITY OF CORDS,

FIRST MOVERS, &c.

AND
DESCRIPTIONS OF MANY CURIOUS AND USEFUL MACHINES.

_Talem intelligo Philosophiam naturalem, quæ non abeat in fumos speculationum subtilium, aut sublimium; sed que efficaciter operetut, ad sublevandi vitæ humanæ incommoda. Bacon. De Aug. Sci.

LONDON:

PRINTED FOR P. C. AND J. RIVINGTON; G. WILKIE ; J. RICHARD

SON; LACKINGTON AND CO.; G. KEARSLEY ; LONGMAN, HURST, REES, ORME, AND BROWN; J. TAYLOR; BALDWIN, CRADOCK, AND JOY; AND WALKER AND EDWARDS,

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