ARTICLE II. Of the Proportions of the Engines.

§ 1. Of the Dimensions of the Parts from
which the Power of the Engine is

§ 2. Of the enunciation of the Power of Lo-
comotive Engines

§ 3. Dimensions of the Fire-box and Boiler
in twelve of the best Locomotive

Engines of the Liverpool and Man-
chester Railway

§ 4. Of Locomotive Engines of a different
construction .

Pages.

30

31

33

36

CHAPTER II.

39

41

OF THE PRESSURE IN STEAM-ENGINES.

ARTICLE I. Of the Pressure calculated according to the
Levers and the Spring-Balance.

§ 1. Of the Principle on which that calcu-

§ 2. Of the Levers and Spring-Balance

§ 3. Of the Corrections to be made to the
Weight marked by the Spring-

ARTICLE II. Of the Mercurial Steam-gauge.

§ 1. Construction and use of the Mercurial-

Steam-gauge.

§ 2. Of the Pressure of Steam in Locomo-

tive Engines, while travelling.

§ 3. Experiments on the Pressure of Steam
in Locomotive Engines

Pages.

ARTICLE III. Of a new Spring-balance and Manometer.

1. Of a proposed modification to the com-

mon Spring-balance

§ 2. Of a new portable Manometer intended

to replace the Mercurial Gauge

§ 3. Comparative Table of the different modes

of expressing the Pressure of Steam

CHAPTER III.

OF THE FRICTION OF RAILWAY-CARRIAGES.

§ 1. Necessity of fresh researches on that

79

81

§ 2. Of the Friction determined by the Dyna-

mometer

§ 3. Of the Friction determined by the Angle

of Friction

§ 4. Experiments on the Friction of Waggons

5. Table of the results obtained in the

above Experiments.

§ 6. Friction of the intermediate Waggons of

the Trains

§ 7 Table of the Results of the foregoing

Experiments on the Friction of the

intermediate Waggons of the Trains

§ 8. Experiments on the Friction of Waggons

without Springs

CHAPTER IV.

OF THE FRICTION OR RESISTANCE OF LOCOMOTIVE

ENGINES.

ARTICLE I. Of the Friction of Locomotive Engines without

Load.

§ 1. Of the different Modes of Determination

85

87

91

93

99

110

112

114

117

§2. Friction of the Engines determined by

the least Pressure

3. Friction of the Engines determined by

the Dynamometer

Pages.

121

§4. Friction of the Engines determined by

the Angle of Friction

§ 5. Table of the results of the above Expe-

riments on the Friction of Locomotive

Engines.

ARTICLE II. Of the additional Friction of Locomotive En-

gines in proportion to the Load they draw.

§ 1. Of the Mode of Calculation .

§ 2. Experiments on the additional Friction

of Locomotive Engines

129

131

134

137

143

§ 3. Table of the Results obtained on the addi-

tional Friction of Locomotive Engines 155

§ 4. New Illustration of the Mode of Calcula-

tion employed

CHAPTER V.

157

GENERAL THEORY OF THE MOTION OF LOCOMOTIVE ENGINES.

ARTICLE I. Of the Velocity of the Piston.

ARTICLE II. Of the Resistance on the Piston, owing to a

given Load.

ARTICLE III. Of the Pressure in the Cylinder.

ARTICLE IV. Of the Evaporating Power of the Engines.

$ 1. Experiments on the Evaporating Power

ARTICLE V. Of the Proportions of the Engines and their

corresponding Effects.

§ 1. Analytical expression of the Velocity of

the Engine with a given Load

§ 2. Analytical expression of the Load that an

Pages.

184

Engine can draw at a given Velocity 191
§ 3. Of the Heating Surface that must be
adopted, to obtain from an Engine a
determined Velocity with a given

Load

§ 4. Of the Maximum Load of an Engine
with a given Pressure

191

192

§ 5. Of the Velocity of the Engine corre-
sponding with the Maximum Load 193
§ 6. Of the Diameter that ought to be given
to the Cylinders, to render an Engine
capable of attaining a fixed Maxi-
mum Load

7. Of the Length that ought to be given
to the Stroke of the Piston of an
Engine, the Cylinders of which have
already a fixed Diameter, so as to
enable that Engine to draw a certain
Maximum Load

§ 8. Of the Diameter that ought to be given

to the Wheel of an Engine, so as

to enable it to draw a fixed Maxi-
mum Load

§ 9. Of the Effective Pressure necessary in

194

195

. 196

§ 11. Table of the Volume of the Steam gene-
rated under different degrees of Pres-

sure, necessary for the application of
the Formulæ .

§ 12. Of the combined Proportions that ought
to be given to the Parts of an Engine,

in order that it may fulfil several
conditions at the same time

ARTICLE VI. Practical Tables of the Proportions and
Effects of the Engines.

§ 1. A practical Table of the Diameter of
the Cylinder and Pressure of Steam,

Pages.

203

205

necessary to enable a Locomotive En-
gine to draw a given Maximum Load 209

§ 2. A practical Table of the Length of
Stroke of the Piston and Diameter
of Wheel, necessary to enable an
Engine to draw a fixed Maximum
Load at a given Pressure

§ 3. A practical Table of the Area of Heat-
ing Surface, capable of producing

a given Velocity with given Loads.
§ 4. A practical Table of the Velocity of
Engines with given Loads, and vice

versa of the Load corresponding to
a given Velocity

ARTICLE VII. Confirmation of the above Formula by
Experiment.

§ 1. Experiments on the Velocity and Load

of the Engines

§ 2. Of the Velocity of the Maximum useful

210

212

214

221

effect

235