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Updated: May 7, 2025
tell Wilkinson to get a dozen cylinders cast and bored ... I have fixed my mind upon making from twelve to fifteen reciprocating engines and fifty rotative engines per annum. Of all the toys and trinkets we manufacture at Soho, none shall take the place of fire-engines in respect of my attention. The captain was on deck, evidently.
The difference between the rotative velocity of the earth in surface-motion at London and at Liverpool is about twenty-eight miles per hour; and this amount of lateral movement is to be gained or lost, as respects the locomotion in each journey, according to the direction we are travelling in from the one place to the other; and in proportion to the speed will be the pressure against the side of the rails, which, at a high velocity, will give the engine a tendency to climb the right-hand rail in each direction.
This annulus may be raised or lowered without being resisted by the pressure of the steam, and in rotative engines it is usually worked by a cam on the shaft. The expansion cam is put on the shaft in two pieces, which are fastened to each other by means of four bolts passing through lugs, and is fixed to the shaft by keys.
This "rotative" system, as it is called, is in effect that which prevails, or has prevailed, in Spain; but it was perfected in Portugal by a device which enabled Ministers, in stepping out of office under the crown, to step into well-paid posts in financial institutions, more or less associated with the State.
If the rotative speed of the earth should be retarded, all objects on the earth would be increased in weight, and if the motion should be accelerated objects would become lighter, and if sufficient speed should be attained all matter would fly off the surface, just as dirt dies off the rim of a wheel at certain speeds.
A. No; rotative engines are generally provided with a fly-wheel to correct such irregularities by its momentum; but where two engines with their respective cranks set at right angles are employed, the irregularity of one engine corrects that of the other with sufficient exactitude for many purposes.
Q. In what way would you class the various kinds of condensing engines? A. Into single acting, rotative, and rotatory engines. Single acting engines are engines without a crank, such as are used for pumping water.
A rotative engine, or steam-wheel. Here we have three of the vital elements required toward the completion of the work: first, steam used expansively; second, the double-acting engine.
Clegg obtained the patent for his horizontal rotative retort; his apparatus for purifying coal gas with cream of lime; for his rotative gas meter; and self-acting governor; and altogether by his exertions the London and Westminster Company's affairs assumed a new and flattering aspect. For reasons which are not assigned, in 1817, Mr. Clegg retired from the service of this establishment.
In other words, a fly wheel is not a source of power, and in many cases it is only a means by which we accomplish rotative speed. It takes power to move matter, and assuming that other conditions are equal, every engine that carries a fly wheel that is larger than is necessary consumes a certain number of foot pounds in turning so much metal around through space.
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