[51] FISHERIES OF THE UNITED STATES. 1 



Atkins's incline-plane return fish- way. — Continued. 



arrangement of partitions in the rectangular compartments 

 for preventing an increase in velocity. Scale: One-half inch 

 to the foot (i±). Designed by Charles G. Atkins, Bucksport, 

 , Me. 29,291. 



Pike's spiral fish-way. 



This is the first spiral fish-way invented in America. In it the 

 compartments are modified into long and narrow sluices. The 

 floors are level, the descent being by means of short vertical 

 falls or steps which occur at regular intervals. The velocity of 

 the water is retarded by frequent changes in the direction of 

 the current and by the contracting of the sluices, which are 

 much narrower at their lower than at their upper ends. In 

 making oue circuit of the waj 7 the water traverses seven sluices, 

 or a total of 68 feet, passing over fourteen steps, which give a total 

 of 42 inches for each current. Scale : One-half inch to the 

 foot (- 2 - f ). 26,931. Great economy of space and material is 

 effected by the spiral arragement, and the outlet of the fish- 

 way naturally comes at the foot of the dam, where the fish can 

 readily find it. 



Atkins's spiral fish-way. 



Model of rectangular compartment fish-way on the inclined-plane 

 systern, in spiral arrangement, in imitation of Pike's spiral 

 fish-way. Scale: One-half inch to the foot {-^). Designed by 

 C. G. Atkins, of Bucksport, Me. 26,949. U. S. Fish Com- 

 mission. This fish- way, which is provided with sluices of dif- 

 ferent heights, can be worked satisfactorily at all seasons, as 

 the river water of any level can be utilized. Each sluice is pro- 

 vided with gates by means of which the quantity of water can 

 be easily regulated. In this model the sides of the fish-way 

 are made of glass, in order that the interior may be more readily 

 seen. 



Bangor fish- way. 



(Model of the fish- way in the Penobscot Eiver at Bangor, Me.) This 

 is a rectangular compartment fish- way on the inclined-plane 

 system, spirally arranged. Its peculiarities are : A large supply- 

 trough, provided with numerous gates, by means of which 

 water, at different levels, can be utilized, and the arrangement 

 of the partitions for retarding the velocity of the current. The 

 abutments which protect it from the ice are also very effective 

 Height of dam, 16 feet. Scale : Three-eighths of an inch to the 

 foot (£2). Designed by Charles G. Atkins, of Bucksport, Me. 

 39,306. Built by the city of Bangor, in 1877, at a cost of $6,000. 



