CATALOG OP THE MECHANICAL COLLECTIONS 131 



MURDOCK INJECTOR, 1890 



U.S.N.M. no. 300186; original patent model; transferred from the United States 

 Patent Office ; not illustrated. 



This injector was submitted with the application for the patent 

 issued to Horace B. Murdock, of Detroit, Mich., November 11, 1890, 

 no, 440183 ; assigned to the American Injector Co. 



This is a double injector having two force tubes arranged in par- 

 allel order and operated with a single actuating shaft. The overflow 

 valves as well as the steam valves of the two sets of tubes are operated 

 by the same shaft so that the steam valve of the first set opens in 

 advance of the steam valve of the second set and the overflow valve 

 of the first set closes in advance of the overflow valve of the second 

 set. The stems of all conical plug valves are extended outside of the 

 injector shell and are provided with slotted ends by which they may 

 be turned with a suitable tool to grind upon the valve seats. 



SCHUTTE INJECTOR, 1892 



U.S.N.M. no. 309010; original patent model; transferred from the United States 

 Patent Office ; not illustrated. 



This injector Avas submitted with the application for the patent 

 issued to Louis Schutte, of Philadelphia, Pa., February 9, 1892, no. 

 468698. 



This is a double-tube injector in which water is delivered by 

 one set of tubes, or nozzles, generally known as the lifting tubes 

 into another set generally known as forcing tubes through which the 

 water is forced into the boiler. The peculiar feature of this injector 

 is a means of increasing or reducing the area of the opening of the 

 steam nozzle of the lifting tubes, by which the quantity of v/ater 

 discharged by the injector is controlled without in any way inter- 

 fering with the operating mechanism for starting and stopping tha 

 injector. 



SELLERS SELF-ACTING INJECTOR, 1900-1927 



U.S.N.M. no. 30D560 ; original ; gift of William Sellers & Co., Inc. ; not illustrated. 



This is a self-adjusting and restarting injector similar to the pre- 

 ceding one, but it does not have the steam jet for lifting water to 

 the injector. It has the floating combining tube of the earlier in- 

 jectors and the combination of two tubes in the same axial line with 

 apertures between them, as in the preceding injector, which develop 

 a vacuum in the feed pipe and make the injector automatically 

 restarting. 



