276 



CREAMERY BUTTER MAKING 



Fig. 78.— injector. 



as follows : Steam issuing from a boiler under 70 pounds 

 pressure has a velocity of 1,700 feet per second. When 

 steam with this high velocity strikes the combining tube 

 A, it produces suction which in turn induces a flow of 

 water. As soon as the water enters the combining tube 

 it is given motion by the high velocity of the steam, 



