38 ROUGH-AND-TUMBLE E: KING 



tube injector. The double tube injector, under the same 

 conditions as above, should work from 14 pounds to 250, 

 and from 15 to 210, but as this injector is not generally 

 used on farm engines you will most likely not meet with 

 it very often. 



The injector should not be placed too near the boiler, 

 as the heat therefrom will make it difficult to start the 

 injector each time after it has been standing idle. 



If the injector is so hot that it will not lift the cold 

 water, there is no way of cooling it except by applying 

 the water on the outside. This is most effectively done 

 by covering the injector with a cloth and pouring water 

 over the cloth. If, after the injector has become cool, i* 

 still refuses to work, you may be sure that there is some 

 obstruction in it that must be removed. This can be done 

 by taking off the cap, or plug-nut, and running a fine 

 wire through the cone valve or cylinder valve. The auto- 

 matic injector requires only the manipulation of the 

 steam valve to start it. There are other makes that re- 

 quire the opening of the steam valve first. It requires 

 some little tact to start an injector (and you will dis- 

 cover that tact is the handiest tool you can have to make 

 you a good engineer). To start an injector of the Pen- 

 berthy type; first give it sufficient steam to lift the water, 

 allowing the water to escape at the overflow for a mo- 

 ment, or long enough to cool the injector, then with a 



