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A gravity wheel must have a diameter equal to the fall of water, or, to use the technical name, the height of the head. The speed at the periphery of the wheel cannot well exceed sixteen feet per second without losing a part of the effect by the wheel anticipating or overrunning the water. This, from the large diameter of the wheels, produces a very slow axial speed, and a train of multiplying gearing becomes necessary in order to reach the speed required in most operations where power is applied. This train of gearing, besides being liable to wear [38]and accident, and costing usually a large amount as an investment, consumes a considerable part of the power by frictional resistance, especially when such gearing consists of tooth wheels. Gravity wheels, from their large size and their necessarily exposed situation, are subject to be frozen up in cold climates; and as the parts are liable to be first wet and then dry, or warm and cold by exposure to the air and the water alternately, the tendency to corrosion if constructed of iron, or to decay if of wood, is much greater than in submerged wheels. Gravity wheels, to realise the highest measure of effect from the water, require a diameter so great that they must drag in the water at the bottom or delivering side, and are for this reason especially affected by back-water, to which all wheels are more or less liable from the reflux of tides or by freshets. These disadvantages are among the most notable pertaining to gravity wheels, and have, with other reasons¡ªsuch as the inconvenience of construction, greater cost, and so on¡ªdriven such wheels out of use by the force of circumstances, rather than by actual tests or theoretical deductions.

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ONE:But the mystery had hardly begun!
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TWO:"Could you ever have thought ... that ... that ... such ... a cruel ... fate would overwhelm us? What crime did these poor people commit? Have we not given all we had? Have we not strictly obeyed their commands? Have we not done more than they asked for? Have we not charitably nursed their wounded in this House? Oh! they profess deep gratitude to me. But ... why then? There is nothing left in the House for the aged refugees whom we admitted, for the soldiers we nurse; our doctor has been made a prisoner and taken away, and we are without medical help. This is nothing for the Sisters and myself, but all these unfortunate creatures ... they must have food...."

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TWO:Maitrank looked up with a wolfish gleam in his eyes.

担当者:ç·å‹™èª² 西田佳å¸
TEL:06-6308-3887(内線215)
mail:

TWO:"I wasn't standing by the door," Hetty said, quietly.

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