242 
INDEX. 
PAGE 
Paddle wheels, table of experiments on, made 
at Maudslay and Field’s manufactory App. 55 
experiments to ascer 
tain the effect of fixing the paddle 
boards at an angle with the radius of 
the wheel . . — 58 
experiments on Her 
Majesty’s ship Lightning, to ascertain 
the difference of speed due to different 
amounts of power . — 62 
do. Dee . — 64 
do. Phoenix — 65 
ratio of speed of a steam 
boat to the power . — 67 
performances of Her 
Majesty’s Post Office steam packets — 68 
—— * speed and consumption 
of coals of nine of the most recently 
constructed of Her Majesty’s steam 
vessels . . — 71 
comparison of the re 
sistance of a steam vessel with that of 
a plane surface . — 76 
Paddles . 301, 302, 308, 309, 314, 315 
number of . . .307 
power of . 302, 303, 304, 314 
modification of . 308, 309 
reefing of . 61 
Papin, Dr. . 5, 7, 9, 16, 25, 31, 139 
’s suggestion of employing the expan 
sion and contraction of steam under a 
piston to form a vacuum . . 5 
’s suggestion of a steam engine being 
applicable to impel machinery . 8 
’s engine . . . ibid 
Parabola . . . 226 
Parabolic paddles . . . 305 
Parallel motion . . 28, 33, 35, 230 
Case I. Where two beams 
are connected by a link, the segments 
of the link are inversely proportional to 
the radii of the beams . . 231 
Rule I. . . 232 
Rule II. . . ibid 
Case II. WLen a beam is 
fitted with a full motion . . ibid 
Parallel motion, foi'mula for . 
PAGE 
233 
rod 
works from a stated centre 
. ibid 
Rule III. 
234 
proportion of finks 
. ibid 
Rule IV. 
235 
Rule V. 
236 
for steam boat engines 
. ibid 
point for the air pump 
rod 
to be attached 
237 
to fix the radius bar 
. ibid 
form of curve described by 
the piston rod 
238 
rules for 
232, 234 
practical rules for 
App. 216 
Passages, steam, area of 
94 
Payne, John 
16 
’s experiment to determine the den- 
sity of steam . 
. 16, 17 
’s disperser 
17 
Peacock, G., master of the Medea 
. App. 83, 94, 98 
Pendulum, conical . 
263 
Perkins, Jacob 
214, 221 
Perronet 
31 
Petroleum 
. 55, 79 
Phosphorus, effect of as fuel . 
108 
Pipes 
254 
Pistons . 
. 10, 213 
Barton’s 
219 
Cartwright’s 
218 
Jessop’s 
221 
Hall's 
334 
Lloyd’s 
334 
Smeaton’s . 
216 
Woolf’s . 
217 
metallic . . 34, 
214, 218 
principles of action 
221 
pressure on 
. 23, 36 
rules for 
App. 222 
slide 
209 
construction of 
214 
arrangement of 
. ibid 
thickness of 
. ibid 
leather 
215 
atmospheric engine 
216