. Appleton's dictionary of machines, mechanics, engine-work, and engineering. side ofthe cylinder. The gate O, resembling a throttle-valve, is fastened to the shaft 1\ which works in stuff-ing-boxes cast in the cylinder. To one end of this shaft n worm-wheel is attached, which, being movedby the endless-screw 11, opens and shuts the II.—67 898 WATER-WHEELS. The screw R is moved by the hand-wheel or governor S. The cylinder D D D, cast in one or mor«pieces, is supported by the timbers T T. U represents a section of the forebay and tail-race. The oil-box is filled with oil through the
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. side ofthe cylinder. The gate O, resembling a throttle-valve, is fastened to the shaft 1\ which works in stuff-ing-boxes cast in the cylinder. To one end of this shaft n worm-wheel is attached, which, being movedby the endless-screw 11, opens and shuts the II.—67 898 WATER-WHEELS. The screw R is moved by the hand-wheel or governor S. The cylinder D D D, cast in one or mor«pieces, is supported by the timbers T T. U represents a section of the forebay and tail-race. The oil-box is filled with oil through the gas-tube a, which runs from the top of the forebay. The tube markedb is to allow the air to escape from the box when it is being filled; that marked c is for drawing off theoil when it is necessary to change it. Should the step wear any, the toe can be changed with greatfacility. The oil-box is held to its proper position in the bridge by set-screws h h. As it is representedin the different figures of this article, there are sometimes wooden steps where it is The operation of the wheel.—The operation of this wheel is very simple ; the top of the cylinder isplaced from 4 to 6 feet from the upper level of the water, or at a sufficient distance to prevent thervater from becoming agitated; thus it will be seen that the movable wheel or turbine is suspendedbetween the two levels of the falL The water is made to come on the wheel and leave it so as to exert WATER-WHEELS. 899 its utmost effect by the proper construction of the guides and buckets, which, together, form an annularsection. The following is the action of the water discharging through the wheels. The water, as it leaves the forebay, follows the guides of the stationary wheel, curved in a spiralform, and leaves them at an angle of 16° to the horizontal line and tangential to the circumference, andthus presses on the movable wheel, which, by the proper course of its buckets, retrogrades and lets the 3840.
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
