A

TREATISE

OF

MECHANICS,

THEORETICAL, PRACTICAL,

AND

DESCRIPTIVE.

BY OLINTHUS GREGORY, LL.D.

OF THE ROYAL MILITARY ACADEMY, WOOLWICH ;

HONORARY 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 SIMPLIFICA-
TION 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 F. 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.

A-H

CONTENTS

OF

VOLUME II.

PRACTICAL MECHANICS.

ON the Construction and Simplification of Machinery

On Rotatory, Rectilinear, and Reciprocating Motions

On Bevel-Geer, and Proportioning the Number of Teeth

On Uniformity and Smoothness of Motion

On the Operation and Use of a Fly

On Friction and the Stiffness of Cords, with the Experiments of

An Example of the Power of the Capstan, allowing for Friction

and the Rigidity of Cords

On Water as a Mover of Machinery

On Wind as a Mover of Machinery, with Smeaton's Rules relative

On the Strength of fired Gunpowder

On Steam as a Mover of Machinery, with the Results of Bettancourt

17

46

48

iv

Bark-mill

Crab for Artillery

Cranes of various Kinds, and a lowering Regulator, by Hardie

Crane, or Syphon, with an Account of Close's and Venturi's

Apparatus to raise Water above its Level

Cylinders, boring of, for Steam-engines

Ellipsograph

160 et

seq.

171

175

176

177

178

179

181