506 



HYDRAULICS AND ITS APPLICATIONS 



from the supply pipe through a strainer, while the space behind the 

 piston is drained into the draught tube. A constant thrust towards the 

 left is thus produced, and since there is a small leakage past the piston 

 this thrust may be very accurately adjusted to suit the conditions of 

 running, by adjustment of the supply valve. Any remaining thrust due 



l^-J2 Guide Vanes 



34 Vanes 



Section on A B. 



Details of Runner and Guide Varies. 



15 Teeth 



I Rev. to open Gates 



Details of Gate Connections. 

 FIG. 239E. Details of Turbine for Snoqualmie Falls. 



to change of load is taken up by a collar thrust bearing situated behind 

 the balance piston. An adjustment of the balance piston supply valve to 

 give balance at f full load renders the thrust bearing liable to a possible 

 thrust of about 25,000 Ibs. at maximum, or very low loads. The. collars, 

 four in number and of 13J inches mean diameter, have a total bearing 

 area of 418 square inches. All bearing surfaces are babbited. The 



