Principles of Construction and Efficiency of Water-wheels

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E. & F.N. Spon, 1876 - 94 Seiten
 

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Seite 72 - ... to which, by the balancing of the contrary fluid pressures due to half the head of water and to the centrifugal force of the water in the wheel, combined with the pressure due to the ejection of the water backwards from the inner ends of the vanes of the wheel when they are curved, only one-half of the work due to the fall is spent in communicating vis viva to the water, to be afterwards taken from it during its passage through the wheel ; the remainder of the work being communicated through...
Seite 72 - ... at the circumference of the wheel, in the condition of fluid pressure. Now, with the velocity already assigned to the wheel, it is found that this fluid pressure is exactly that which is requisite to overcome the centrifugal force of the water in the wheel, and to bring the water to a state of rest at its exit ; the mechanical work due to both halves of the fall being transferred to the wheel during the combined action of the moving water and the moving wheel. In the foregoing statements, the...
Seite 8 - The object of the second law of motion is to assert that the effect produced by a force is irrespective of the previous motion of the body : it is enunciated thus : — ' When a force acts on a body in motion, the velocity it would produce in the body...
Seite 80 - ... of the velocity of the water, yet the impulse of the water in the case of a maximum is more than double of what is assigned by theory ; that is, instead of J of the column, it is nearly equal to the whole column.

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