CENTRIFUGAL THROWERS. 
221 
for the solid jet and two smaller ones with crooked passages, which 
conduct the water into the barrel in such an eccentric manner as to 
cause rotation and a resultant spray. The narrow crooked passages 
are easily clogged and not readily cleaned except in the case of the 
one last mentioned, which is pictured in section in Plate XXYI, Fig. 
6. The plug hole, c, directly connects the hose passage, a, with the 
barrel, i — «, except when turned in the position shown, where the spiral 
grooves, e e, give the eccentric spray streams. These grooves being 
cut entirely in the plug, any accumulations in them will be pulled out 
with the plug when it is removed for cleaning, which gives some ad- 
vantage over the others. This is the plan of the so-called " Faery 
pipes" which are now for sale by the trade. Mr. John Gielow, of Chi- 
cago, 111., patented in 1877 (No. 187123) a hose-nozzle producing the 
rotation by a spiral worm-passage through the center of the plug 
above and at right angles to its smooth bore, which does not appear to 
have any special advantages. 
Mr. C. B. Ilosford patented in 1881 (No. 237084) a hose-pipe having 
beyond the plug an annular stationary core with an objectionably com- 
plex, eccentric course for producing rotation and choking. 
SPRAY-WIIEKLS. — Spray wheels form a group of very different cen- 
trifugal water-throwers including several fountain jets constructed on 
the principles of Barker's mill and as oblique-faced spa; ter- wheels all 
IDOved by the force of the jet, but none of these have proved of prac- 
tical value for our present purposes. 
Allied to these are the centrifugal machines operated by power and 
noticed hereafter, as brash-throwers, whirling reels, fans, and toothed 
fans in the groups of throwers of poison, &c. 
II. — CENTRIFUGAL THROWERS. 
[Plato XXVII.] 
In this section I present some resullsof my study and experimentation 
pertaining to the use of rotary brushes, reels, &c< 
The sprinklers and dusters in this group are driven by hand power or 
machinery, and thus originate the motion of the poison, which receives 
no other impulse. These should not be confounded with wheel nozzles, 
among centrifugal nozzles, where the motor power was already imparted 
to the poison before it reached the wheel, which, instead of giving mo- 
tion, only somewhat retards and deflects that of the poison, and this by 
its impact operates the wheel from which it flies off. The devices here 
to be noticed throw the poison by rotating tubes, reel prongs, brushes, 
or recesses. 
Among these the brush- throwers promise most. They are not so lia- 
ble to clog as are the common sifters and many-punctured sprinklers. 
