. Machinery and processes of the industrial arts, and apparatus of the exact sciences. o that the pallets are sustained by lateral walls. This figure is strictly in section onlywhere the shading isoblique; the othershaded parts beingbeyond the surface ofsection. Thus, aboveand below the hub,through which theaxis passes, are theopen circles throughwhich the water en-The pallets, asseen in the larger fig-are roundededges withinlimit, in orderthat the influx may beas smooth as rotary apparatusis thus a box withina larger box, withwhich it is in contactonly on two annularsurfaces just
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. o that the pallets are sustained by lateral walls. This figure is strictly in section onlywhere the shading isoblique; the othershaded parts beingbeyond the surface ofsection. Thus, aboveand below the hub,through which theaxis passes, are theopen circles throughwhich the water en-The pallets, asseen in the larger fig-are roundededges withinlimit, in orderthat the influx may beas smooth as rotary apparatusis thus a box withina larger box, withwhich it is in contactonly on two annularsurfaces just at thecircumference of theadmission contact here mustbe as close as possiblewithout serious Mo-tional resistance. Therevolving drum, asobserved above, is notcylindrical. As thewater moves outward-ly from the centrali ^; opening with a ve- , locity always increas- Gwynne & Centrifugal Pump—scale. 1-12. ing, theory indicates that for a two-fold reason the breadth of each pallet parallel to theaxis should diminish toward the circumference. For. first, if there. GWYNNE & CENTRIFUGAL PUMP. 179 were no acceleration of movement, the superficial area of each con-centric cylindrical section would have to be the same, which couldonly be made true by reducing its length in proportion to the increase ofthe radius j and in the second place, a proper provision for the realacceleration which is presumed to occur, would require an additionalreduction. These are the indications of the centrifugal theory. Practi-cally it will be obvious on the merest inspection of any centrifugal pumpthat they are carried out only partially. In fact, there is no need forattention to the second particular, since it is not in the least desirablethat the velocity of the water in a radial direction should be the other hand, the condition of greatest efficiency in this particularwill be satisfied by giving such form to the rotating apparatus that thesame volume of liquid shall
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