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back pressure body Boyle's law carbon chimney combustion commencement compound engine compression condenser connecting rod consequently constant corresponding crank crank arm crank-pin cubic foot curve cut-off dead centre diameter distribution valve effect equal evaporation exhaust steam expansion valve external flues fly-wheel foot-pounds force friction fuel furnace gases gear given heat engine heat expended heat required heating surface Hence high-pressure horse-power hyperbola increase indicator diagram isothermal jacket Lancashire boiler large cylinder latter length locomotive means metal motion moving multiplied piston rod plates portion position pressure and volume quantity of heat radius raise rate of expansion ratio represented resistance right angles riveted shaft sides slide valve small cylinder space specific heat square inch steam engine steam is cut steam port steam pressure stroke supposed surface condensers tangential thermal units tion total heat tubes valve circle velocity vertical weight
Page 23 - The immediate cause of the phenomena of heat then is motion, and the laws of its communication are precisely the same, as the laws of the communication of motion.
Page 23 - Heat, then, or that power which prevents the actual contact of the corpuscles of bodies, and which is the cause of our peculiar sensations of heat and cold, may be defined a peculiar motion, probably a vibration of the corpuscles of bodies, tending to separate them. It may with propriety be called the repulsive motion.
Page 149 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Page 231 - ... of an eccentric is the distance from the centre of the shaft to the centre of the eccentric disc. Usually the centre of the disc is within the circumference of the shaft ; but this does not alter the nature of the device, which remains simply a short crank with a large crank pin. THE SCOTCH YOKE OR SLOTTED CROSS-HEAD. The usual method of connecting the cross-head to the crank pin by means...
Page 32 - The temperature of a body is its thermal state considered with reference to its power of communicating heat to other bodies...
Page 3 - ... higher and higher, till all the water is boiled away, and nothing but steam is left in the cylinder. Now this machine, consisting of cylinder, piston, water, and fire, is the steam-engine in its most elementary form. For a steam-engine may be defined as an apparatus for doing work by means of heat applied to water...
Page 40 - The Specific Heat of a body is the ratio of the quantity of heat required to raise that body one degree to the quantity required to raise an equal weight of water one degree.
Page 380 - H, H. About one-third of the tubes (those marked with a cross in the figure) are threaded and provided with nuts, and thus act as stayrods for the flat surfaces occupied by the tubes. The flat sides of the combustion chambers are stayed to each other and to the rear head by the staybolts S, S. The flat tops of the combustion chambers, called the crown sheets, are strengthened by the girder stays, or crown bars, C, C.
Page 147 - Mechanics we treat of the effects of forces on bodies ; a force being anything which produces or tends to produce motion in a body, or which changes or tends to change the motion of a body. If one force alone acts on a body, only one effect can take place — the body must move in a straight line ; for whenever a body at rest appears to be acted on by a single force, a little consideration will show that one or more others are in play.