509 



HYDRAULICS AND ITS APPLICATIONS 



effective head of 260 feet. The runner is mounted in a spiral casing and is 

 66 inches outside diameter and 9J inches wide through the vanes, which 

 are thirty-four in number. The guide vanes, thirty-two in number, are 



FIG. 239A. Front Elevation of Single Wheel Horizontal Shaft Francis Turbine for 

 Snoqualmie Falls, developing 10,000 H.P. at 300 revs, per min. under 260 ft. head. 



of the pivoted type and are connected by means of arms projecting 

 radially inward, as shown in Fig. 239s, to a movable ring concentric with 

 the turbine shaft. This ring is rotated by means of a pinion actuated by 

 she governor, which gears into a rack mounted at the extremity of a 

 rocking lever. This lever transmits its motion to the ring by means of 



