318 



APPLIED SCIENCE 



An ejector is similar in form and operation to an injector, 

 but is used to lift water without forcing it against pressure. 



An inspirator is a 

 STEAM i i , x 



dou ble - j et inj ector ; 



one jet lifts the water, 

 arid the other forces it 

 into the boiler. 



359. Water-Heat- 

 er. Before entering 

 the boiler, water is 

 heated in a heater by 

 exhaust steam. This 

 heater consists of a 

 vessel filled with brass 

 tubes. Steam passing 

 through or around the 

 tubes causes the tem- 

 perature of the water 



to be raised. This process prevents steam from condensing in 

 the boiler as it would if cold water entered. Moreover, the 

 salts are deposited in the boiler instead of in the heater. An 

 economizer is a device consisting of iron or steel tubes through 

 which feed water passes while the products of combustion 

 circulate around the tubes. A steam separator is used to 

 remove moisture from steam before entering the engine 

 cylinder. A steam trap is a device to remove condensed 

 steam from steam pipes without allowing any of the live 

 steam to escape. 



A damper regulator is an apparatus for regulating the damp- 

 er and controlling the draughts by the pressure of steam on the 

 boiler, This regulator has the power to move the damper or 



FIG. 168. Injector. 



