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Updated: June 2, 2025
In escaping through this valve, a fall of about 200 lbs. pressure per square inch is made to do work on the surrounding steam and drive it forward in the pipe, producing a pressure on the low-pressure piston considerably higher than the back-pressure on the high-pressure piston.
The latter rushed below to learn what had happened, and found that she had burst her low-pressure cylinder, a misfortune impossible to repair until a new one could be obtained from Halfa and fitted. In spite of this, however, the advance was not delayed. On the 13th the 1st, 2nd, and 3rd Brigades occupied Kaderma.
How men existed or did any business at all before the advent of the "ticker" is a wonder. But the Chamber, the creator of low-pressure and high-pressure, the inspirer of the "ticker," is the great generator of business. Here I found Henderson in the morning hour, and he came up to me on the call of a messenger. He approached, nonchalant and smiling as usual.
They are compound, each having a high-pressure piston with an area of 20 square inches, a low-pressure piston of 50.26 square inches, and a common stroke of 1 foot.
The temple doors would open by themselves when the fire burned on the altar, and would close again when that fire was extinguished, and the worshippers would think it a miracle. It is interesting because it contained the principle upon which was afterwards attempted to be made the first working low-pressure or atmospheric steam-engine. Yet it was not steam, but air, that was used.
It makes three distinct sounds a rushing, a hissing, and a coughing or puffing sound; and if you stand on the brink and close your eyes it is no trick at all to imagine that you are sweeping down a river on a large low-pressure steamer, and that you hear the hissing of the steam about her boilers, the puffing from her escape-pipes and the churning rush of the water abaft her wheels.
While their columns are dancing up and down with laughter at this somewhat tepid and low-pressure pleasantry, there come in a New York Reaumur and a Centigrade from Chicago. The Fahrenheit, which has got warmed up to temperate, rises to summer heat, and even a little above it. They enjoy each other's company mightily.
"You know how a low-pressure engine acts; the steam does a part of the work and the weight of the atmosphere does the rest. Now this man Overholt thinks he can make the atmosphere do both parts of the work with no steam at all, and as that's absurd, of course, he won't get any more of my money. It's like getting into a basket and trying to lift yourself up by the handles."
The bosun's breath was coming in labored gasps, yet still that terrible man kept holding him close, drawing his waist to him and increasing his pressure as he drew. "You've the tonnage and engine-room of a battleship," jeered Kieran, "but you've only the steam of an East River tug. And a low-pressure tug at that. And what little steam you had is gone. You've a big engine but no boiler.
The Woolf engine in the tandem form, having generally the high-pressure and low-pressure cylinders in line with each other, but occasionally alongside, and always communicating their power to one crank. Such a pair of engines is used sometimes singly, oftener two pairs together, working side by side to cranks at right angles; recently three pairs together, working to cranks placed 120 deg. apart.
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