164 TKANSACTIONS OF THE 



Figure 2, is a perspective view of the 

 internal cylinder, on which the felt cloth 

 or other filtering fabric is wound, and 



secured by brass wires, wound around at the top and bottom, and 



at intervals between. 



Figure 3, is a side view of the stop-cock, through which the 

 water may be drawn, and by means of which its direction through 

 the felt may be changed. This filter is intended to be attached 

 at its upper end to the pipe tlirough which the water is received. 

 The water enters a central opening in the top of the stop-cock C. 

 This stop-cock or faucet is fitted into the hub, in the middle of 

 the hollow arms d, which cross the cylinder]] at its top and bottom. 

 These arms, d, have holes, e and f, which extend outward, the 

 hole f extending through the rim of the filtering cylinder, so as 

 to deliver the water outside of the felt cloth, and the hole e ter- 

 minating inside of the filtering cloth. The hollow bar which 

 crosses the bottom of the filtering cylinder B, is similar to the bar 

 d at the top, except that the relative positions and directions of 

 the holes e and f are reversed. These holes in the upper bar 

 receive the water from the hole g, in the upper part of the stop- 

 cock, and the holes in the lower bar return it into the stop-cock, 

 through the hole k, after it has passed through the felt, when the 

 stop-cock is turned into a position to allow the water to pass in 

 either direction. As before stated, the holes e and f, in the lower 

 bar, are in reverse position to those in the upper bar, and thus 

 while that in the upper bar, which discharges outside of the 

 cylinder B, receives water from the opening g, and so discharges 

 it, the same water is received (after being filtered through the felt) 

 into that opening in the lower bar which terminates inside of the 

 cylinder, and passes through it and the opening k, into the lower 

 end of the stop-cock C, Irom which it is discharged, through a 

 central opening at the bottom. If the position of the stop-cock 

 C is reversed (which may be done by means of the handle b) so 

 as to bring the hole g to correspond with the hole e, in the upper 

 bar, the current is reversed, and by this means the filter is readily 

 cleansed of ordinary impurities, without taking it apart, by simply 

 turning the stop-cock in the opposite direction from that in which 



