An Experimental Enquiry Concerning the Natural Powers of Water and Wind to Turn Mills1760 - 77 Seiten |
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An Experimental Enquiry Concerning the Natural Powers of Water and Wind to ... John Smeaton Keine Leseprobe verfügbar - 2016 |
Häufige Begriffe und Wortgruppen
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Beliebte Passagen
Seite 37 - ... whole, than low ones can be admitted to do ; for a wheel of 24 feet high may move at the rate of 6 feet per second without losing any considerable part of its power...
Seite 27 - ... the full effect of the power, and to make the most of it : for, if we suppose the height of a column of water to be 30 inches, and resting...
Seite 54 - ... squalls of wind. The best structure, therefore, for large mills is that where the quantity of cloth is the greatest, in a given circle, that can be : on this condition, that the effect holds out in proportion to the quantity of cloth ; for otherwise the effect can be augmented in a given degree by a lesser increase of cloth upon a larger radius, than would be required...
Seite 9 - ... raife half the weight to double the height; or double the weight to half the height, in the fame time that another can, thofe two powers are equal.
Seite 33 - ... same effect a second time. The ratios between the powers so estimated, and the effects at the maximum, deduced from the several sets of experiments, are exhibited at one view in column 9. of Table II. ; and from hence it appears, that those ratios differ from that of 10 to 7-6 to that of 10 : 5-2, that is, nearly from 4 : 3 to 4 : 2.
Seite 38 - ... and this will be known, by dividing the effect it ought to produce in a given time by the space intended to be described by the circumference of the wheel in the same time : the quotient will be the resistance overcome at the circumference of the wheel ; and is equal to the load required, the friction and resistance of the machinery included.
Seite 62 - The load at a maximum that sails of a similar figure and position will overcome at a given distance from the centre of motion, will be as the cube of the radius.
Seite 33 - ... a consequence thereof, that non-elastic bodies, when acting by their impulse or collision, communicate only a part of their original power ; the other part being spent in changing their figure, in consequence of the stroke. The powers of water, computed from the height of the wheel...
Seite 35 - ... a part of it over, fo much of the power is loft. The velocity that the circumference of the wheel ought to have, being known by the following deductions, the head requifite to give the water its proper velocity is eafily computed from the common rules of hydroftatics; and will be found much lefs than what is generally pra&ifed.
Seite 25 - ... to the ratio of 20 to 15, or of 4 to 3, when the power is greateft, whether by increafe of velocity, or quantity of water, this feems to be the moft applicable to large works...