on entering the case distributes itself through a rectangular
supply chamber SC, from which it finds its way equally to the
four guide-blade passages G, G, G, G. In these passages it
acquires a velocity about equal to that due to half the fall, and is
directed into the wheel at an angle of about 10° or 12° with the
tangent to its circumference. The wheel W receives the water
in equal proportions from each guide-blade passage. It consists
of a centre plate p (fig. 189) keyed on the shaft aa, which passes
through stuffing boxes on the suction pipes. On each side of
the centre plate are the curved wheel vanes, on which the pressure
of the water acts, and the vanes are bounded on each side by
dished or conical cover plates c, c. Joint-rings j, j on the cover
Page:EB1911 - Volume 14.djvu/111
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HYDRAULICS
99