Water-power; an outline of the development and application of the energy of flowing water . s in and out of connection are sup-posed to be of the form shown at Fig. 175. With thesearrangements it will be perceived that no wheel can run whilea wheel to the right of it is stopped. If it were desired toarrange the mechanism so that auj wheel could be stoppedwith the others running, the simplest way is to introducemechanism for lowering the crown-gear and drawing it out ofconnection with the jack. (See Fig. 174.) This design shows in a strong light the disadvantage of alow head, in respect of the
Water-power; an outline of the development and application of the energy of flowing water . s in and out of connection are sup-posed to be of the form shown at Fig. 175. With thesearrangements it will be perceived that no wheel can run whilea wheel to the right of it is stopped. If it were desired toarrange the mechanism so that auj wheel could be stoppedwith the others running, the simplest way is to introducemechanism for lowering the crown-gear and drawing it out ofconnection with the jack. (See Fig. 174.) This design shows in a strong light the disadvantage of alow head, in respect of the cumbrous character of the mechanismrequired to raise the velocity to the rate called for by a sufficiently high head the dynamo can be coupled directlyto the horizontal shaft and save the expense and loss of powerincident to intermediate connections. The Lachine Rapids —Fig. 219 shows inplan the power-house and appurtenances at the Lachine * This description is gathered mainly from an article in EngineeringNews, February 18, 1897. AT THE LACHINE RAPIDS. 499. •500 THE POWER-HOUSE. Rapids on the St. Lawrence River some 6 miles above Mon-treal. This is one of the numierous rapids which occur on theSt. Lawrence between Lake Ontario and tide-water. Theyoccupy some 5 miles of the river-channel, with a total fall ofabout 30 feet. A dam across the river here would not bepermissible even were such a work practicable. The onh-mode of making the fall available was to construct a spur-dam,\\ hich we call the main dam, at right angles to the shore,extending into the stream a sufficient distance, and from thatpoint to extend a wing-dam up the stream to a distance suffi-cient to raise the required head. Fig. 220/show^s the generalsituation and surroundings. Fig. 220^ shows the main dam,wing-dam, and booms for protecting the work from ice. is a longitudinal section showing the wing-dam in eleva-tion. The wing-dam extends some 3700 feet above the mainda
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
