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Updated: May 7, 2025
Q. What are the chief varieties of the steam engine in actual practical use? A. There is first the single-acting engine, which is used for pumping water; the rotative land engine, which is employed to drive mills and manufactories; the rotative marine engine, which is used to propel steam vessels; and the locomotive engine, which is employed on railways.
The rotative apparatus shown is an immense affair, with a series of eight tall tanks arranged on a circular carriage and rotating on a vertical axis, so as to bring each in turn to the charging and discharging positions. Each tank has its own system of pumps. Beet-root is difficult to exploit for various reasons, chemical and other.
In ordinary rotative condensing engines of good construction, 10 lbs. of coal per nominal horse power per hour is a common consumption; but such engines exert nearly twice their nominal power, so that the consumption per actual horse power per hour may be taken at from 5 to 6 lbs. Engines working very expansively, however, attain an economy much superior to this.
Rotatory engines have not hitherto been very successful, so that only the single acting or pumping engine, and the double acting or rotative engine can be said to be in actual use.
It would be extremely difficult to explain the action of the rotative effects obtained in these wires under any other theory than that which I have advanced; and the absolute external neutrality that we obtain in them when the polarities are changing, we know, from their structure, to be perfectly symmetrical.
This marks one of the most important stages in the development of the steam engine. It was at last the portable machine it remains to-day, and was placed wherever convenient, complete in itself and with the rotative motion adaptable for all manner of work.
It is simply necessary to add enough weight to the moving parts, that is, to the piston, piston rod, fly wheel, etc., to cut off early in the stroke and secure rotative speed with the most economical results and with the cheapest construction.
No less than five different methods for rotatory motion are described in the patent, the fifth commonly known as the "sun and planet wheels," of which Watt writes to Boulton, January 3, 1782, I have tried a model of one of my old plans of rotative engines, revived and executed by Mr.
Could the journey be performed in two hours between London and Liverpool, this lateral movement, or rotative velocity of the locomotive, would have to be increased or diminished at the rate of nearly one-quarter of a mile per minute, and that entirely by side-pressure on the rail, which, if not sufficient to cause the engine to leave the line, would be quite sufficient to produce violent and dangerous oscillation.
From the vertical point, where this force is nothing, to the horizontal point, where it is at its maximum, the force of torsion exerted on the crank shaft is constantly varying; and the fly wheel by its momentum redresses these irregularities, and carries the crank through that "dead point," as it is termed, where the piston cannot impart any rotative force.
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