SLOT-NOZZLES. 
201 
But it will be simple to make the spout, a, so short that obstructing 
matter may be removed through it. 
In Fig. 1 is seen a similar rotary nozzle, but with a slot,s, following in 
its cylindrical periphery. The slot increases in width in the direction 
of rotation (from right to left) for reasons given above. The screw-cap 
c affords a large entrance to the chamber. I have used this same kind 
of nozzle, made of brass, in the more compact form shown in Fig. 2, 
where the opening above is by a screw-plug, c. The plug may be solid 
or it cau be hollow and have a slot also. In this case it may be set by 
screw or otherwise towards either of the outside lips, which then serve 
individually as deflectors or for partly closing the inner slot to thin the 
spray. 
Nozzles of this kind may have the rotation chamber of small diam- 
eter, even as small as that of the Supply tube as shown in Plate XVI, 
Figs. 4 and 5. Of these, Fig. 5 has its discharge on the side, at right 
angles to the spout, and is for spraying upwards, while Fig. 4 ex- 
hibits a nozzle for direct sprays. In this figure is also presented a plan- 
section of the latter. The lettering is the same for the three figures. 
The slot is marked 9, the plug, c, the spout, a, and o represents an ec- 
centric entrance, admittiug the liquid from the spout, a. 
These rotary slot nozzles are very compact and convenient, supplying 
the spray in any direction desired. 
The nozzle shown in Plate XVI 1 1, Figs. 1* and 3, presents some other 
additions which may be made in this class. The spout, a, leads to a cham- 
ber, /<, formed by two plates or caps, c, held together by the screw or 
thumb-screw, w. One or both of these may have a part of one edge cut 
away to leave a slot-like outlet between them, as at ft. Here it will be 
seen that the outlet grows wider in the direction of rotation, and one 
lip has a bevel beyond which it shows a deflector-rim in section at p. 
A free, loose projectile, t, whirls with the liquid inside of the annular 
chamber, to wipe away or disintegrate any obstructing materials which 
lodge upon the interior of the slot. It is preferable to unite the screw 
last to one cap, which then answers as a thumb-head for it, while the 
other works as a nut. By unscrewing, it can be opened. In Fig. 2 the 
same parts will be seen, and it differs in having the slot continue en- 
tirely around between the caps, which do not at any point quite meet 
by their margins, but are held thus apart by a central column penetrated 
by, or formed on, the screw. With a low deflector this would throw a 
circular or dish-shaped spray, but with the rim. />, higher, as shown, the 
spray is thrown in a bowl-shaped form. 
After this consideration of the more essential principles pertaining to 
slot-nozzles we are prepared to judge better of the value of various 
kinds that have appeared in the trade. 
Simple slot-nozzles. — The practice of squeezing the end of a hose 
to flatten the jet of water into a spray has loug been in vogue, and the 
