THE OREGON SPORTSMAN 

ALlunttn REVOLVING 
SELF-CLEANING FISH SCREEN 
Th Aitken Revolving Fish Screen was invented to meet the 
demand made by the laws of Oregon that irrigation ditches and 
water conduits be adequately screened against the passage of fish. 
DESCRIPTION 
A study of the accompanying illustration or cut will explain 
its mechanism. The Screen receives its motive power by a 
hydraulic motor operated outside the flume. A small amount of 
water is piped from the bottom or side of flume to the cups on 
the motor wheel, and power is transmitted to the Screen by the 
use of two sprocket wheels (4 to 8x1). The smaller wheel is 
fastened on the motor shaft, the larger on the screen shaft, using 
sprocket chain to transmit the power. 
This Screen wil! operate in all stages of high or low, swift 
or dead water because it does not depend on the rate of flow for 
its operation. The Screen should revolve slowly so that the 
pressure of water will cause any leaves, moss or other debris, to 
adhere to the screen, thus carrying it over with the stream; this 
feature makes it self-cleaning. 
Properly installed this Screen should require no attention for 
the season. Instructions for installing the Aitken Screen accom- 
pany all screens sold, 
For further information address, 
SAM. L. SANDRY, Superintendent of Fish Screens, 
Rogue River, Oregon. 
OR 
CARL D, SHOEMAKER, State Game Warden, 
Portland, Oregon. 
