TAILIEUCHUNG - Five Hundred and Seven Mechanical Movements - North, Dug_9

Tham khảo tài liệu 'five hundred and seven mechanical movements - north, dug_9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http Mechanical Movements. 107 439. A method of obtaining a reciprocating motion from a continuous fall of water by means of a valve in the bottom of the bucket which opens by striking the ground and thereby empty- ing the bucket which is caused to rise again by the action of a. counter-weight on the other side of the pulley over which it is suspended. 440. Represents a trough divided transversely into equal parts and supported on an axis by a frame beneath. The fail of water filling one side of the division the trough is vibrated on its axis and at the same time that it delivers the water the opposite side is brought under the stream and filled which in like manner produces the vibration of the trough back again. This lias been used as a water meter. 441 Persian wheel used in Eastern countries for irrigation. It has a hollow shaft and curved floats at the extremities of which are suspended buckets or tubs. The wheel is partly immersed in a stream acting on the convex surface of its floats and as it IS thus caused to revolve a quantity of water will be elevated by each float at each revolution and conducted to the hollow shaft at the same time that one of the buckets carries its fill of water to a higher level where it is emptied by coming in contact with a stationary pin placed in a convenient position for tilling it. 4 4 a. Machine of ancient origin still employed on the river Eisach in the Tyrol for raising water. A current keeping the wheel in motion the pots on its periphery are successively immersed filled and emptied into a trough above the stream 443. Application of Archimedes s screw to raising water the supply stream being the motive power. The oblique shaft of the wheel has extending through it a spiral passage the lower end of which is immersed in water and the stream acting upon the wheel at its lower end produces its revolution by which the water is conveyed upward continuously through

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