Compound Locomotives 89 



situated in the lower boiler tubes. Exhaust- 

 ing from the high-pressure cylinder the 

 steam enters a mixing chamber where it is 

 met by low-pressure steam at 250 Ib. pres- 

 sure, which has previously passed through 

 a low-pressure superheater situated in the 

 upper boiler tubes. From the mixing 

 chamber steam enters the two outside 

 cylinders and thence to the exhaust. 



