rotary 
■ modes of applying 
■ paddles . 
for vessels 
Prony, R. 
Propelling vessels . 
screw 
Pumping expels air from water 
water 
301, 306, 313, 314 
313, 325 
33, 120, 230 
297 
App. 231 
168 
274 
Pumps, rule for finding the volume of App. 214 
finding the power requisite 
to discharge a given quantity of water ibid 
finding the velocity neces 
sary to discharge a given quantity of 
water . . App. 216 
finding the diameter of, 
to discharge a given quantity of water 
ibid 
App. 2 
R. 
Radius bar 
Rail road 
Raising water, engines for 
Reciprocating engine 
Rectilinear motion of steam 
Regulating by cataract 
injection 
expansion 
production of steam 
of the fire 
Regulation of power 
by pump 
Regulator 
air 
Renwick, Dr. J. 
Resistance of parts 
of fluids 
Roy, General 
Ruby, Gravesend packet, engines of 
Rule for conversion of heat into steam 
for the quantity a gas or vapour ex 
pands under a constant pressure . 82 
Rules, practical, for boilers . App. 207 
the dimensions of, for 
any given power when rectangular ibid 
when cylindrical — 208 
the requisite thickness 
of plates for . App. 208, 209 
the height of a column 
of water to supply a boiler against any 
proposed pressure . — 
cylinders, requisite 
thickness of . . — 
chimney, area of 
eccentric — 
fire grating — 
governor 
PARALLEL MOTION — 
the point in 
the link where the piston rod must be 
attached 
the length of 
the radius bar . — 
the length of 
radius bar when it and the piston rod 
are attached to the links at different 
distances 
the lengths of 
ibid 
218 
— 219 
9, 
parallel bar and radius bar, when the 
latter works from a stated centre — 
piston rod,diameter of — 
pumps—the number of 
cubic feet in the volume of a cylinder — 214 
the power re- 
2 i