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Even the wall of the mill had given way before it and the cold light of dawn crept in through a jagged aperture that marked its resistless course. The fly-wheel was gone and the damage was done; but there was still, of course, the post mortem.
A. Boulton and Watt's rule for finding the dimensions of the fly-wheel is as follows: Multiply 44,000 times the length of the stroke in feet by the square of the diameter of the cylinder in inches, and divide the product by the square of the number of revolutions per minute multiplied by the cube of the diameter of the fly-wheel in feet.
To obtain this power an engine of stupendous proportions is sometimes attached directly to the rollers, but more frequently an engine of rather less horse-power will be used, the might of this engine being applied to giving rapid rotation to an immense fly-wheel, which may thus be regarded as a reservoir full of energy.
As James says, "Habit is the enormous fly-wheel of society, its most precious conservative agent." Because of its power of limitation it is sometimes considered the foe of independence and originality, but in reality it is the only road to progress. Other things being equal, the more good habits a person has, the greater the probability of his doing original work.
Mareschal in the following way: The jack carries along in its motion a horizontal fly-wheel, V, against whose rim there bears an iron shoe, F, placed opposite an electro-magnet, E. In the ordinary position, this shoe, which is fixed to a spring, bears against the felly of the wheel and stops the jack through friction.
The centrifugal force of the same wheel, however, increases as the square of the velocity; so that if the velocity of a fly-wheel be doubled, it will have four times the amount of centrifugal force. Q. Can you give a rule for determining the centrifugal force of a body of a given weight moving with a given velocity in a circle of a given diameter? A. Yes.
A few years before it was while I was an apprentice I read in the World of Science, an English publication, of the "silent gas engine" which was then coming out in England. I think it was the Otto engine. It ran with illuminating gas, had a single large cylinder, and the power impulses being thus intermittent required an extremely heavy fly-wheel.
One promising use of the turbine or steam-jet used to propel a fly-wheel filled with liquid as described has for its object the supply of the electric light in country houses. In this case the fly-wheel is fitted, on its lower side, to act as the armature of a dynamo, and the magnets are placed horizontally around it.
Some copying-presses have a screw so accurately turned and so well oiled, and handles so massively like a fly-wheel, that a touch will send the handles whizzing round and round till they stop suddenly, and then one slight wrench more, and the letters are duly copied! But this was not such a press. It had been outworn in Mr.
Of course it is always possible to race the engine, throw in the clutch, and gain some power from the momentum of the fly-wheel, and many a bad place may be surmounted step by step in this way; but this process has its limitations also, and the fact remains that with a gasoline machine it is possible to carry a given load only so fast, but if the machine moves it all, it will continue to move on until the load is increased, or the road changes for the worse.
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