If the forthcoming tests turn out as expected, it should be a simple 

 matter to calculate the size of plant required to put the operation on a paying 

 basis. 



Power-Driven Pneumatically Controlled Roller Press 

 for Fish Scale Impressions 



For the purpose of determining the age of fish, which requires the 

 preparation of thousands of cellulose acetate slides, a power-driven roller 

 press with pneumatic cylinders for controlling the roll pressure was built during 

 the winter of 1956. 



The two main advantages of this design over the hand operated- mechanical 

 pressure adjusted type are, first, the pneumatic cylinders give more accurate roll 

 pressure control and also automatically compensate for small irregularities in the 

 thickness of the slides, and second, the power-driven feature, greatly increases 

 the output of the machine, while at the same time eliminating strain on the 

 operator. 



Fish Cooker - Steam Jacketed Screw Type 



To assist in fisheries research, and the Ontario Agricultural College, in 

 their experiments on the utilization of coarse fish and smelts for mink and other 

 animal food, a steam jacketed screw cooker, having a capacity of one ton of fish 

 per day, was constructed and completed in March 1956. 



This cooker has been used successfully by the staff at the South Baymouth 

 Fisheries Station. 



New Type of Survey Post 



At the request of the Division of Surveys, the design of a new type of 

 survey post is being investigated. 



The drawbacks to the present type of post are that there is a 3 1/2 inch 

 disc fastened to the bottom end which prohibits it from being driven into the 



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