132 BULLETIN 173, U. S. NATIONAL MUSEUM 



DESMOND INJECTOR, 1901 



U.S.N.M. no, 309190 ; original patent model ; transferred from the United States 

 Patent OflSce; not illustrated. 



This model was submitted with the application for the patent issued 

 to John Desmond, of Cincinnati, Ohio, October 8, 1901, no. 683914; 

 assigned to the Lunkenheimer Co. 



Features of this injector are the construction of the starting lever, 

 which with one motion operates both the steam and overflow valves 

 and also permits the ovei^flow valve to close independently of the 

 lever; a removable ring of resistant metal inserted in the combining 

 tube at its smallest diameter to receive the corroding action of the jet 

 at that point; and an arrangement of steam and water passages 

 designed to prevent the raising of the temperature of the feed water 

 to such a temperature as to deposit scale within the tubes of the 

 injector. 



ALLEN AUTOMATIC INJECTOR, 1902 



U.S.N.M. no. 309176 ; original patent model ; transferred from the United States 

 Patent Office ; not illustrated. 



This model was submitted with the application for the patent issued 

 to Charles B. Allen, of Wadsworth, Ohio, April 15, 1902, no. 697770. 



This injector is designed to start itself automatically when supplied 

 with steam and connected to the water supply and to restart auto- 

 matically if for any reason the jet should be temporarily interrupted. 

 The peculiar feature of the injector is the forcing tube, which is pro- 

 vided with two successive overflows formed in it by a series of 

 laterally opening holes which have a definite areal relation to the 

 smallest cross-sectional area of the combining tube and which are in 

 addition to the usual large overflow between the combining tube and 

 the forcing tube. 



SELLERS EXHAUST FEED- WATER HEATER INJECTOR, 1925 



Plate 27, Figure 2 



U.S.N.M. no. 309561 ; original ; gift of William Sellers & Co., Inc. ; photograph 

 no. 15316B. 



This is a nonlifting injector within which water from the locomo- 

 tive tank is heated by exhaust steam, picked up by one set of exhaust 

 steam injector tubes, and delivered to a live-steam injector, which 

 forces the water into the boiler at a temperature of about 260° to 

 300°. The object of this design of injector is to save the large quantity 

 of heat usually lost in the exhaust steam and return it to the boiler, 

 thereby improving the economy of operation of the locomotive. 



