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PROFESSOR O. REYNOLDS AND MR. W. H. MOORBY 
the 4-inch brake shaft by set pins, so that it revolves with the shaft (figs. 2 and 3), 
and (2) a brake (or brake case) which encloses the wheel, the shaft passing through 
hushed openings in the case which it fits closely, so as to prevent undue leakage of 
water while leaving shaft and brake-wheel free to turn in the case, except for the 
slight friction of the shaft (figs. 1, 2 and 3). 
The outline of the axial section of the brake-wheel is that of a right cylinder, 4 inches 
thick. The cylinder is hollow—in fact, made of two discs which fit together, forming 
Fig. ]. 
an internal boss for attachment to the shaft, and also meet together at the periphery, 
forming a closed annular box, except for apertures to be farther described (fig. 3). 
In each of the outer disc faces of the wheel are 24 pockets (carefully formed), 
4^ inches radial and 1^ inches deep measured axially, but so inclined that the narrow 
partitions or vanes (^ inch) are nearly semicircular discs inclined at 45° to the 
axis ; the vane on one face being perpendicular to the vane on the opposite face 
(%• 2 ). 
