TRACK 



TRACK"^ 



CHAIN WITH HANGER 



LINK 



TRACK 



LINK 

 WITH 

 HANGER 



Figure 3. — Support and guide for the drive on the traveling 

 screen. 



LINKS AND 

 HANGERS 



SCREEN 



RUB-RAIL 



RUB-RAIL 



WOOD 

 FLOOR 



Figure 4. — Screen and 25-mm, flat bracket attachments. 



OPERATION 



Model I 



Figure 5 shows a plan view of the first 

 traveling screen. The continuous belt screen 

 traveled from the upstream end (A) to the 

 entrance of the bypass (B) at a 20° angle to 

 the flow. This portion of the screen was 

 supported by the two stationary rub-rails. 



As the screen traveled from B to C it 

 passed a rubber seal vvhich formed a flexible 

 joint between the bypass wall and the screen; 

 the seal prevented loss of fish. To support 

 the screen as it passed from B to C and to 

 hold it against the rubber seal, two 18-cm. 

 pulleys were mounted on a vertical shaft that 

 extended from the downstream pocket sheave 

 to the floor. The top pulley was 76 cm. from 

 the floor; the other was 10 cm. 



After it passed throughthe downstream seal, 

 the screen traveled upstream against the cur- 

 rent to point D, and around the upstream 

 sheave, past another seal similar to the one 

 downstream, to point A. Traveling at 1.5 m. p. s., 

 the screen made a complete circuit in 5.5 

 seconds. 



Model II 



A second traveling screen was designed to 

 eliminate the drag of the screen as it traveled 

 through the water on its return upstream. This 

 was accomplished by lifting the screen out of 

 the water on its return upstream. 



Figure 6 is a schematic drawing of modelll. 

 The screen traveled from the upstream end 

 F to the downstream sheave G on a 20° angle 

 to flow G. At point G the screen passed 

 around a sheave and turned into the flume at 



Figure 5. — Plan view of horizontal traveling screen, model I. 



3 



