HYDRAULIC RIVETERS 



775 



suit the length of rivet to be handled. The working cylinder, to the left, 

 is fitted with a differential ram so as to allow a larger range of work to 



FIG. 389. Fixed Hydraulic Riveter. 



be handled with economy. In this case the pressure supply to each ram 

 is regulated by a separate valve. 



ART. 206. HYDRAULIC LOCK-GATE MACHINERY. 



In the majority of modern docks the lock gates or caissons are actuated 

 by hydraulic machinery. In the new "Royal Edward" Dock at 



