Tracts on HydraulicsThomas Tredgold M. Taylor, 1836 - 219 sider |
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Side 48
... distance from the centre of the upright axis . H is a barrel upon the upright axis , whereon is wound a cord ; which , being drawn by the hand , gives a circular motion to the axis , and to the arm F G , and thereby carries the axis of ...
... distance from the centre of the upright axis . H is a barrel upon the upright axis , whereon is wound a cord ; which , being drawn by the hand , gives a circular motion to the axis , and to the arm F G , and thereby carries the axis of ...
Side 54
... distance between the centre and the extremity , to stand at an angle of 25 ° 41 ′ with the plane of the motion ; in which case the velocity of that part of the sail , when loaded to a maximum , would be equal to that of the wind , or c ...
... distance between the centre and the extremity , to stand at an angle of 25 ° 41 ′ with the plane of the motion ; in which case the velocity of that part of the sail , when loaded to a maximum , would be equal to that of the wind , or c ...
Side 65
... distance from the centre ; it therefore follows , that the extremity of all similar sails , with the same wind , will have the same absolute velocity ; and , therefore , take a space of time to perform one revolution in proportion to ...
... distance from the centre ; it therefore follows , that the extremity of all similar sails , with the same wind , will have the same absolute velocity ; and , therefore , take a space of time to perform one revolution in proportion to ...
Side 66
... distance of every similar section , from the centre of motion , will be as the radius ; the distance of the centre of power of the whole , from the centre of motion , will be as the radius also : that is , the lever by which the power ...
... distance of every similar section , from the centre of motion , will be as the radius ; the distance of the centre of power of the whole , from the centre of motion , will be as the radius also : that is , the lever by which the power ...
Side 85
... distance of this centre of gravity from the centre of motion at 20 feet , as he states it , p . 38 , art . 849 , the circumference will be exceeding 126 feet English measure : a wind , therefore , to make the mill go twenty turns per ...
... distance of this centre of gravity from the centre of motion at 20 feet , as he states it , p . 38 , art . 849 , the circumference will be exceeding 126 feet English measure : a wind , therefore , to make the mill go twenty turns per ...
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Tracts on Hydraulics: 1. Smeaton's Experimental Papers on the Power of Water ... Thomas Tredgold Uten tilgangsbegrensning - 1836 |
Vanlige uttrykk og setninger
angle aperture appears applied axis Bossut buckets Canal centre centre of gravity centrifugal force circumference collision column communication of motion conical tube consequently contracted vein cylindrical tube deductions descending discharge distance ditto double Dutch sails eddies enlarged sails equal expenditure extremity fall fluid force four cubic feet friction given gravity greater greatest half height Hence horizontal hydraulic impelling power impulse inches increase JOHN SMEATON lateral communication length less lines in diameter load machine Maxim maximum mechanic power mill minute move nearly non-elastic soft bodies number of turns observed orifice overshot wheel particles perpendicular pipe plane plane sails pressure produced proportion proposition quantity of water radius ratio reservoir resistance river River Thames scale set of experiments side square root stream striking body suppose surface theory thin plate undershot velocity vessel vibrations watermills whole wind
Populære avsnitt
Side 39 - However, as every thing has its limits, so has this: for thus much is desirable, that the water shall have somewhat greater velocity, than the circumference of the wheel, in coming thereon ; otherwise the wheel will not only be retarded by the buckets striking the water, but thereby dashing a part of it over, so much of the power is lost.
Side 61 - ... 2. The load at the maximum is nearly but somewhat less than, as the square of the velocity of the wind, the shape and position of the sails being the same.
Side 45 - ... which is equal to the difference of level between the surface of the water in the...
Side 34 - ... inches, and there impinging upon another body, would be capable of producing an equal effect by collision, as if the same cubic inch had descended through the same space with a slower motion, and produced its effects gradually ; for, in both cases, gravity acts upon an equal quantity of matter, through an equal space...
Side 41 - Experience confirms that this velocity of 3 feet in a second is applicable to the highest overshot wheels as well as the lowest ; and all other parts of the work being properly adapted thereto, will produce very nearly the greatest effect possible. However, this also is certain, from experience, that high wheels may deviate farther from this rule, before they will lose their power, by a given aliquot part of the whole, than low ones can be admitted to do : for a wheel of 24 feet high may move at...
Side 67 - The effects of sails of similar figure and position are as the square of the radius. 9. The velocity of the extremities of Dutch sails, as well as of the enlarged sails, in all their usual positions when unloaded, or even loaded to a maximum, is considerably greater than that of the wind.
Side 57 - a broader sail requires a greater angle ; and that when the sail is broader at the extremity, than near the centre, this shape is more advantageous than that of a parallelogram.* Many have imagined, that the more sail the greater the advantage, and have therefore proposed to fill up the whole area: and hy making each sail a sector of an ellipsis, according to M.
Side 76 - ... with that of a vertical one, it is manifest that the power of a vertical mill will be four times as great as that of an horizontal one, let the number of vanes be what they will. This disadvantage arises from the nature of the thing...