THE HALL SEGMENTAL RADIAL GATE 



For securing thre e-p art control of water flow 



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Our Circular describing the Hall Segmental Gate, which we will send on application, gives a clearnu derstanding of this most a 

 and practical device. For the first time the constantly recurring poblem of the absolute control of diversion dams, main cai 

 lateral ditches is clearly solved. You will catch the basis idea instantly from the subjoined skeleton diagrams. 



We call this " three-part regulation " because the problem always is to control surface flow (for trash) underflow (for silt and sand), 

 simultaneously and yet independently, and at the same time maintain the upper lip in the proper position for safety spill, so that the 

 canal may never be over-charged and a wash-out result. 



Again, a diversion dam in connection with the canal head gates must always be able to reject the floating trash and sand at the 

 intake and discharge them through the dam. Moreover, the pond above the diversion dam must neither be allowed to fill up, nor must 

 the water level be lowered below the service point. Yet it must at the same time be controlled against sudden rises which would over- 

 top the head gates. 



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This is a complex proposition and varies with every stage of flood. By the Hall Gate it is absolutely under control, no matter what 

 the combination. The gates themselves scarcely cost more than the ordinary "Tainter" or "Drum" gate and are operated far more easily. 

 The same type of gate is equally applicable to control a reservoir level on the crest of a spillway. The various figures herein shown 

 are to a certain extent self-explanatory the Circular will be wholly so. Send for it. Respectfully submitted, 



AMBURSEN HYDRAULIC CONSTRUCTION COMPANY, 



NEWTON L. HALL, District Engineer, Colorado Bldg., DENVER, COLO. 



ENGINEER - CONSTRUCTORS 

 88 Pearl St., BOSTON, MASS. 



