3^30 BULLETIN 173, U. S. NATIONAL MUSEUM 



regulated, and stopped by means of a single lever requiring no hand 

 adjustment for variations in pressure of steam, height of lift, or 

 temperature of the feed water. 



WOTAPEK INJECTOR, 1884 



U.S.N.M. no. 309181 ; original patent model ; transferred from the United 

 States Patent OflSce; not illustrated. 



This model was submitted with the application for the patent issued 

 to Joseph Wotapek, of New York, N. Y., May 6, 1884, no. 298329; 

 assigned to the Nathan Manufacturing Co. 



The improvement involved in this injector is the use of a nozzle 

 holder by which the scale-incrusted nozzle or tube of the injector 

 may be easily removed to permit cleaning. The holder is threaded 

 into the shell of the injector from which it and the tube are drawn 

 by unscrewing the holder. The holder turns independently of the 

 tube so that the tube itself is not subjected to torsion when being 

 withdrawn from the shell. 



JENKS AND HART INJECTOR, 1886 



U.S.N.M. no. 309182 ; original patent model ; transferred from the United States 

 Patent Ofl5ce ; not illustrated. 



This model was submitted with the application for the patent 

 issued to James Jenks and Thomas J. Hart, Detroit, Mich. 



The principal feature of this injector is the method provided for 

 varying the area of the water passage that surrounds the steam-forc- 

 ing jet. A conical nut screwed onto threads on the outside of the 

 steam tube forms one wall of the water space. The position of the 

 nut on the tube and the area of the water space are changed by turn- 

 ing the nut. The nut is turned by a handwheel, worm, and worm 

 wheel. 



SELLERS SELF-ACTING INJECTOR, 1887-1927 



U.S.N.M. no. 309559; original; gift of William Sellers & Co., Inc.; not illus- 

 trated. 



This is a modern lifting injector that incorporates features de- 

 veloped in 1887. The injector has an auxiliary annular steam nozzle 

 that lifts the water and discharges into a draft tube surrounding 

 the forcing steam nozzle from which the jet receives the impulse 

 that causes it to enter the boiler. Free discharge is provided for the 

 lifting jet with the result that a vacuum is maintained in the lifting 

 pipe, which always raises water to the injector after interruptions 

 of the water supply and restores the continuity of the jet. 



