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One of the principal practical objections to this locomotive was the enormous quantity of coke consumed or wasted by it—about 692 lbs. per hour when travelling—caused by the sharpness of the steam-blast in the chimney, which blew a large proportion of the burning coke into the air.
From without came voices; the grinding of chains lifting cargo; a great basso from a smoke-stack; more voices. "All off! All off!" Feet scurrying over wooden decks! "All off! All off!" A second steam-blast that shot up like a rocket. "Mamma? Ray? Papa? Haven't any of you got anything to say?" "Gott in Himmel!" said Mrs. Binswanger. "Gott in Himmel!" "So!" said Mr.
This plan succeeded perfectly, the expansion of the copper tubes completely filling up all interstices, and producing a perfectly watertight boiler, capable of withstanding extreme internal pressure. The mode of employing the steam-blast for the purpose of increasing the draught in the chimney, was also the subject of numerous experiments.
The combustion in the furnace was quickened by the adoption of the steam-blast in the chimney. The heat raised was sometimes so great, and it was so imperfectly abstracted by the surrounding water, that the chimney became almost red-hot.
The waste steam was thrown into the chimney through a tube inserted into it at right angles; but it will be obvious that this arrangement was not calculated to produce any result in the way of a steam-blast in the chimney. In fact, the waste steam seems to have been turned into the chimney in order to get rid of the nuisance caused by throwing the jet directly into the air.
Already their hearing is distracted by the locomotives that rush between Rome and Frascati; already the shriek of the steam-blast daily and nightly hisses insolently at the respectable comedy of the past between Rome and Civita Vecchia. Steamboats, another engine of disorder, furnish the bi-weekly means of an invasion of the most dangerous character.
Some of these solid materials are evidently fragments of the rock-masses, through which the volcanic fissure has been rent; these fragments have been carried upwards by the force of the steam-blast and scattered over the sides of the volcano.
The steam-blast had scarcely been adopted, with so decided a success, when Stephenson, observing the numerous defects in his engine, and profiting by the experience which he had already acquired, determined to construct a second engine, in which to embody his improvements in their best form.
The result was anything but decisive; and the locomotive might have been condemned as useless, had not our engineer at this juncture applied the steam-blast, and by its means carried his experiment to a triumphant issue. The steam, after performing its duty in the cylinders, was at first allowed to escape into the open atmosphere with a hissing blast, to the terror of horses and cattle.
Stephenson's earliest important improvement in the locomotive consisted in his invention of what is called the steam-blast, by which the steam is made to increase the draught of the fire, and so largely add to the effectiveness of the engine.
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