FISHWAYS. 



105 1 



«■'■ 



'""^'^^""^^^^f^^^T^T^TTZ-. 



lo/7^. Sec//on. 



Fig. 17. — Cam^r^. 



S<fc//o/7j?-S. 



This 6shway consists of a suitable chute submerged in the water as shown, and is provided with a series of sUts in 

 the bottom through which a current of water enters under a static pressure opposing the descending current of water 

 in said chute. The design was later on improved by adding to the slits in the bottom a corresponding number of slits in 

 the sides. 



IV. LOCK AND GATE SYSTEM. 



Figures 18 and 19 show the admission of a body of water by gates into a 

 lock chamber and out of it to a lower level, whereby fish are being lifted vertically 

 in ascending a stream. 



Lo/T^ SecA'o/i. 



Fig. 18, — Kirk. 



Plan. 



Process: If valve M is opened chamber HII will fill with water, and. by means of passageways under abutment J, 

 the water will pass into chamber L and force gates CD to rise. The gates will rise until the water reaches an overflow 

 opening at L. If valve M is closed and K opened, the water under the gates escapes and they will go down to position 

 C D'. Making the lower set of gates double the height of the upper set and arranging for an automatic alternate rising 

 and lowering of the gates at certain intervals of time, the fish are enabled to pass upstream through these locks thus 

 forming. 



