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Updated: June 2, 2025
Edison's problem in educating the public was rather difficult, for while his low-pressure, direct-current system has always been absolutely without danger to life, there has also been the undeniable fact that escaping electricity might cause a fire just as a leaky water-pipe can flood a house.
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.
Old odors laden with memory rushed to meet her; that pungency which, unaccountably enough, reeks of the cold boiled potato, and which old upholsteries, windowless hallways, and frequent meat stews can generate. There was a blob of low-pressure gaslight in the hallway, a weak and watery eye burning from a side bracket into the odor so poignant with association. Tony Eli drowned at eighteen.
Should it become necessary, while operating, to shut down the condenser and change over to non-condensing operation, particular care should be observed that the change is not made too suddenly to non-condensing, as all the low-pressure sections of the turbine must be raised to a much higher temperature.
"To the RUSSIA! Why she sailed yesterday afternoon at four o'clock." "Slight accident to her low-pressure cylinder," explained Brownson. "She was delayed for several hours and was to sail early this morning. I beg your pardon why, excuse me, Mr. Indiman "
Not that the final result would have been any different. Her machinery was an expression of the latest progress in marine engineering, being a combination of reciprocating engines with Parsons's low-pressure turbine engine, a combination which gives increased power with the same steam consumption, an advance on the use of reciprocating engines alone.
The two smaller balance pistons, L and M, are allowed to remain on the high-pressure end; but the largest piston, Z, is placed upon the low-pressure end of the rotor immediately behind the last ring of blades, and working inside of the supplementary cylinder W. Being backed up by the body of the spindle, there is ample stiffness to prevent warping.
Merely an area of low barometric pressure an area where the air has become lighter than the air of surrounding regions. Under influence of gravitation the air seeks its level just as water does; so the heavy air comes flowing in from all sides towards the low-pressure area, which thus becomes a "storm-centre." But the inrushing currents never come straight to their mark.
With the exception of the cylinders, pistons, valves, and valve chests, the engines are of the same size, corresponding to the equal maximum pressures which come into action in each cylinder, and in this respect alone the engine differs in principle from an ordinary twin machine. From the receiver it is led into the low-pressure cylinder, C1, and thence into the condenser.
She had a low-pressure engine, which at times proved inadequate to stem the current, and in such a crisis the crew got out their shoulder poles and pushed her painfully up stream, as had been the practice so many years with the barges. At night she tied up to the bank. Only one other steamer reached St. Louis in the same twelve months.
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