THE MOST RECENT DISCOVERIES IN THE ARTS AND SCIENCES.

BY DAVID BREWSTER, LL. D.

F. R. S. LOND. & SEC. R. S. ED. &c. &c.

THIRD EDITION.

IN TWO VOLUMES.

WITH TWENTY-SEVEN PLATES.

VOL. II.

EDINBURGH:

PRINTED FOR STIRLING & SLADE, AND BELL & BRADfute,
EDINBURGH; AND G. & W. B. WHITTAKER, LONDON.

1823.

女

ΤΟ

Q157 F45 1823

LIEUTENANT-GENERAL DIROM,

OF MOUNT ANNAN,

FELLOW OF THE ROYAL SOCIETIES OF LONDON & EDINBURGH,

THIS ENLARGED EDITION

OF

FERGUSON'S LECTURES

IS INSCRIBED,

IN TESTIMONY OF THE RESPECT AND ESTEEM

OF

THE EDITOR.

M348802

CONTENTS OF THE SECOND VOLUME.

CHAPTER I.

On Mechanical Agents, or the First Movers of Machinery page 1

SECT. I. On the Strength of Men and Animals

SECT. II. On the Force of Water, and the mode of ap-

2

On a Double Overshot Wheel, with a Chain of Buckets 57

On the Performance of Overshot and Undershot Wheels 59

On Wheels driven by the reaction of Water, or Bar-

Method of keeping off the back-water from Water-Wheels 63

SECT. III. On the Force of Wind, and the mode of ap-

plying it to drive machinery

SECT. IV. On the Force of Steam, and the method of ap-

plying it to drive machinery

64

64

69

81

89

On the Formation of the Teeth of Wheels, the Leaves of Pi-

nions, and the Wipers of Stampers

On the Teeth of Rack-work

On Interior and Exterior Epicycloids, and the Dispo-

sition of the Teeth of Wheels

Tables of the Pitches of Wheels

138

146