Practical Essays on Mill Work and Other Machinery, Volume 1

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Page 486 - was much earlier in use, called in some parts of England a Lift-Tenter. "By means of the centrifugal force of one or more balls, which fly out as soon as the velocity is augmented, and as they rise in the arc of a circle, allow the end of a lever to rise with them, while the opposite end
Page 453 - to be a power implanted in all matter, by which it resists any change endeavoured to be made in its state; that is, by which it becomes difficult to alter its state, either of rest or motion.
Page 500 - When going at half that velocity. The result was, .that the last required just half the quantity of water which the first did. It is to be observed, that in these experiments the quantities of water were calculated from the heads of water and apertures of the sluices. ... . ; From these experiments
Page 479 - and the moving power remains the same, an alteration in the velocity of the mill will take place; it will move faster or slower. Every machine having a certain velocity at which it will work at greater advantage than at any other
Page 485 - In a wind-mill, when the velocity is increased by the irregular action of the wind, the corn is sometimes forced rapidly through the mill without being sufficiently ground. There is an elegant contrivance for preventing this, (similar to the governor of a steam-engine,) but which
Page 480 - Two balls are fixed to the ends of rods, in continual revolution, and as soon as the motion becomes a little too rapid, the balls rise considerably," and, by the intervention of a lever, act upon a throttle-valve* which diminishes the
Page 508 - for ten seconds, they will produce equal velocities. But the spaces through which the bodies are carried, are very unequal, being as ten to one: and if the square roots of the powers producing the effects be taken, that will give the times they take in carrying the body acted upon through equal spaces.
Page 507 - that whether space or time be taken as the measure of action, the same must be taken for the measure of the effect, to have the results proportionate and equal. But if the cause be measured by time, and the effect by space, the results will be as the squares of the
Page 563 - I hope some tables which I have annexed, respecting the strength of several substances, will be acceptable to the reader; the table of squares and cubes, as also the square roots and cube roots of all numbers from one to 1000, which I have taken the liberty to extract from Dr.
Page 516 - of the circumference of an overshot wheel in feet per second, should be 2-67 times the square root of the whole height of the fall in feet. Again, that part of the fall is to be determined, which will give the water the same velocity as the wheel, and since a

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