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air-pump apparatus ascent atmospheric engine atmospheric pressure axis barometer beam boil boiler bottom called caloric centre coal cohesion cold water communication condense the steam constructed contrivance crank descent diminished DIONYSIUS LARDNER effect elastic force equal exhausting valve flow flue fluid fly-wheel force of steam fuel furnace gine grate greater cylinder greater piston heat hot water inches of mercury increased invention LECTURE lesser piston lever liquid machine manner Marquess of Worcester mechanical mercury method motion moved necessary Newcomen opened and closed opens upwards paddle paddle wheels paddle-boards passes patent piston-rod placed position presses principle production of steam proportion quantity raised regulator represented in fig resistance revolves Savery Savery's engine side square inch steam-engine steam-pipe steam-tight sufficient supply of steam suppose surface temperature thermometer tical tion tube UNIVERSITY OF LONDON upper steam valve vacuum valve g vapor velocity vessel Watt weight wheel
Page 23 - hours, it burst and made a great crack. So that, having a way to make my vessels so that they are strengthened by the force within them, and the one to fill after the other ; I have seen the water run like a constant stream forty feet high. One vessel of water rarefied by fire
Page 156 - heard, the crews, in some instances shrunk beneath the decks from the terrific sight, and left their vessels to go on shore ; while others prostrated themselves, and besought Providence to protect them from the approaches of the horrible monster which was marching on the tide, and lighting its path by the fires which it vomited.
Page 23 - up forty of cold water, and a man that tends the work has but to turn two cocks ; that one vessel of water being consumed another begins to force and refill with cold water and so successively ; the fire being tended and kept constant, which the self same person may likewise abundantly perform in the interim between turning the said cocks.
Page 22 - spharam activitatis, which is but at such a distance. But this way hath no bounder if the vessel be strong enough. For I have taken a piece of whole cannon whereof the end was burst, and filled it three quarters full of water, stopping and
Page 28 - communicating by the tubes T T' (marked by the same letters in fig. 7.) with the greater boiler D. Let s be a pipe, called the suction pipe, descending into the well or reservoir from which the water is to be raised, and communicating with each of the
Page 70 - the steam thus admitted acted merely by its expansive force, which became less in exactly the same proportion as the space given to it by the descent of the piston increased. Thus during the last two-thirds of the descent the piston is urged by a gradually decreasing force which in practice was found just sufficient to
Page 137 - cold water pump, &c. are dispensed with, and nothing is retained except the boiler, cylinder, piston, and valves. Consequently, such an engine is small, light, and cheap. It is portable also, and may be moved, if necessary, along with its load, and is therefore well adapted to locomotive purposes.
Page 44 - condensation of steam must be regulated. When the piston has been forced to the bottom of the cylinder by the atmospheric pressure acting against a vacuum, in order to balance that pressure, and enable it to be drawn up by the weight of the pump-rod, it is necessary to introduce steam from the boiler.
Page 58 - with the condensing water, which, accumulating, would collect in the cylinder and resist the descent of the piston. To remedy this he proposed to form a communication between the bottom of the condenser and a pump which he called the AIR PUMP, so that the water and air,
Page 38 - These, however, were not the only defects of Savery's engines. The consumption of fuel was enormous, the proportion of heat wasted being much more than what was used in either forcing up the water, or producing a vacuum. This will be very easily understood by attending to the process of working the engine