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Updated: June 11, 2025
It was composed of two parts—the fore part consisting of a small steam-engine, formed of a round copper boiler, with a furnace inside, provided with two small chimneys and two single-acting brass steam cylinders, whose pistons acted alternately upon the single driving-wheel.
The two pistons move simultaneously, and the resistance in the air cylinder rapidly increases as the air is compressed. The early direct-acting compressor used steam at full pressure throughout the stroke.
The arrangement of the cylinders in Vee form over the crankshaft, enabling the pistons of each pair of opposite cylinders to act upon the same crank pin, permits of a very short, compact engine being built, and also permits of reduction of the weight per horsepower, comparing this with that of the vertical type of engine, with one row of cylinders.
An unusually severe pitch, for the sea was rising, had lifted the big throbbing screw nearly to the surface, and it was spinning round in a kind of soda-water half sea and half air going much faster than was proper, because there was no deep water for it to work in. As it sank again, the engines and they were triple expansion, three cylinders in a row snorted through all their three pistons.
The engineer led Frederick to the engine-room and down a perpendicular iron ladder. The warm, heavy smell of oil almost robbed Frederick of his breath. The downward climb seemed endless. On all sides the engines were working. Frederick glanced at the gigantic cylinders, in which the compressed steam was moving pistons up and down like pump handles.
If, therefore, a steam boiler is surrounded by a vessel containing a solution of hydrate of soda, having a high boiling point, and if the steam, after having done the work of propelling the pistons of an engine, is conducted with a reduced pressure and a reduced temperature into the solution, the latter, absorbing the steam, is diluted with simultaneous development of heat, which produces fresh steam in the boiler.
Philanthropists are commonly grave, occasionally grim, and not very rarely morose. Their expansive social force is imprisoned as a working power, to show itself only through its legitimate pistons and cranks. The tighter the boiler, the less it whistles and sings at its work. When Dr.
These holes are occupied by loose-fitting pistons which play vertically up through the cushion lying level with it when at rest, and when in motion projecting about two inches above it at the height of their stroke.
The pistons banged alarmingly as they compressed the water that spurted from the drain-cocks, and his progress was marked by violent jerks that jarred the couplings of the bogie truck. Though Dick only wore a greasy shirt and overall trousers, he felt the oppressive heat, and his eyes ached with the glare as he gazed up the climbing track.
There was a storm of sparks, a deluge of nails, an ocean of pistons, vices, levers, valves, girders, files, and nuts; a sea of melted metal, baulks of timber and bar-steel. Iron filings filled your throat. There was iron in the atmosphere; the men were covered with it; everything reeked of iron.
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