200 



The Spraying of Plants. 



(Fig. 19 a). The size of the opening was entirely under the 

 control of the operator, and in case of clogging it could be 

 opened to its fullest extent. 



It was about this time that the " Wellhouse " nozzle was first 

 made * (Fig. 19 6). It is made after the pattern of a gas jet, 

 but much larger. 



In 1892 the first automatic cleaning nozzle was invented 

 (Fig. 19 d), it having been suggested by the device shown in 

 Fig. 19 c. It has since been offered for sale, in a modified 



FIG. 19. a, " Bailey " ; b, " Wellhouse " ; c and d, forms which led to the con- 

 struction of e, the "McGowen." 



form, having been named the "McGowen," after its inventor. 2 

 In this nozzle (Fig. 19 e) the opening is formed by two pieces 

 of metal which remain in contact when not in use. One piece 

 is movable and is in the form of a piston which moves back- 

 ward and forward in a cylinder placed at right angles to the 

 main shaft. As the pressure in the shaft increases, the size of 

 the opening enlarges, and in this manner any obstruction which 

 may become lodged at the outlet orifice will cause an increase 



1 Invented by Walter Wellhouse, Fairmount, Kan. See a full illustrated account 

 in Hep. Kan. Hort.'Soc. xviii. 99. 

 > John J. McGowen, Ithaca, N. Y, 



