SLOT-NOZZLES. 201 



But it will be simple to make the spout, «, 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, e. The plug may be solid 

 or it can 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 s'mall 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 s, the plug, c, the spout, a, and o represents an ec- 

 centric entrance, admitting 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 XVIII, Figs. 2 and 3, presents some other 

 additions which may be made in this class. The spout, «, leads to a cham- 

 ber, /i, 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 s. 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 2^- 

 A free, loose projectile, t, whirls with the liquid inside of the annular 

 cliamber, to wipe away or disintegrate any obstructing materials which 

 lodge upon the interior of the slot. It is preferable to unite the screw 

 fast 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 long been in vogue, and the 



