248 



again uniting they escape to the exterior, forming a cone of liquid much more ex- 

 tended than that which can be obtained by the Riley atomizer. 



We have long employed this, and have found it really good, naturally under such 

 conditions as we shall see further on. [Pages 36-37 of report above mentioned.] 



Dr. Alpe continues, quoting- Professor Oettoiini as to the various other 

 styles of nozzles shown at the exposition, and concludes the discussion 

 of nozzles by indorsing Professor Cettolini's views, that a simple rub- 

 ber tip, which can be compressed and deflexed by a spring, so as to 

 regulate the amount and direction of the spray, is superior, at least for 

 spraying lime solutions, to tlie metal nozzles. 



The more important modifications brought out in France and alluded 

 to in the above extract may now be treated at greater length in connec- 

 tion with drawings of each. 



The Noel Nozzle. — The Xoel nozzle, as made by the firm of Xoel, Paris, 

 is shown at Fig. 57. It is constructed on essentially the same princi- 

 ple as the 'Riley nozzle, except that the upper parts of the chamber and 

 the discharge orifice are somewhat modified. 



The circular chamber is abruptly widened at the top, making in fact a 

 separate chamber of larger diameter supjeradded to the lower chamber. 

 On the shoulder thus formed rests a circular disk, f7, flat or slightly 

 concave below, and which plays up and down between the shoulder 

 and removable cap c, which closes the end of tbe upper chamber, a 

 space of about three sixteenths of an inch. The center of this disk is 

 pierced with an opening, as in the Eiley, and the upper surface is built 

 up around this orifice, both from its outer circumference and the edge of 

 the central orifice, into a rim surrounding a conical depression in the 





"N ^ /WvSA 



Fig. 57.— The Noel nozzle (original). 



center of the disk. This rim, when the valve like disk is raised, pro- 

 trudes through the face of the removable cap, and when lowered is 

 nearly on a level with its outer surface. 



The liquid on entering the chamber first issues from the central ori- 

 fice, exactly as in the Kiley type, and is diffused in a diverging cone- 

 shaped spray, but the pressure of the whirling liquid rising into the 

 upper chamber forces itself around the valve-like disk d, and depress- 

 ing it, partially' issues around the outer rim of the disk in a converging 

 cone of spray, thus interfering with tbe discharge from the central 

 orifice. It is claimed this tends to arcater diffusion and admits of the 



