202 BUCKINGHAM: BALANCING OF TURBINES 



unbalanced thrust forward of I — t, or ts of the whole propeller 

 thrust at full power. A correction to be applied introduces an 

 improvement. The condenser pressure while it falls somewhat, 

 does not fall to j of its value at full power, and as the condenser 

 pressure is acting on the forward end of the L.P. rotor — in the 

 case of the divided turbine — the steam thrust aft is in reality 

 somewhat greater than \ and the balance closer than just com- 

 puted. 



The residual thrust can not, in any case, be computed very 

 accurately, but it is quite evident that if the balance is good at 

 full speed it can not be far off at half speed. The automatic 

 readjustment of the pressure distribution which occurs upon a 

 change in the amount of steam supplied, is favorable to preserv- 

 ing a balance existing before the change, and intermediate valves 

 are superfluous in this respect as they have proved to be in others. 



A more detailed treatment of this subject, with numerical illus- 

 trations, will be published elsewhere. 



