PHYSICS 



Research In the physical limnology of the Great Lakes was assigned as 

 the ma^or task for the physics group, this being part of the Great Lakes Research 

 program* The research Is aimed primarily at application to commercial fisheries y 

 .. 1ro.t the Information Is valuable to studies of lake pollution and of shore erosion 

 as well* 



Monthly synoptic surveys were made In Georgian Bay and In Lake Huron; 

 those In the latter were done as a co-operative project with the University of 

 Michigan. Measurements of lake temperatures, chemical constitution, and crirrents 

 were made In preliminary assessment of the seasonal variations In the physical 

 nature of these bodies of water* In time It will be possible to relate these 

 changes to the movements and growth of populations of fish and the aquatic life 

 upon which they feed* Arrangements were made for conducting similar surveys In 

 lakes Erie and Ontario In 1955* 



The Great Lakes studies were partially Interrupted In the winter by a 

 hydrologlcal study of the floods from Hurricane Hazel* Field observations were 

 made of the effects of the floods, and of the precipitation that caused them, 

 In collaboration Yrlth other sections In the Division of Research and with the 

 aid of other Divisions* The report based on these studies Incorporated In 

 addition a number of recommendations concerning flood control and flood warnings* 



MECHANICAL SECTION 



The projects and other work carried out by the Mechanical Section are 

 described below* 



Conifer Leaf Still 



The construction of this still for extracting essential oils from 

 conifer leaves was completed In June 195^* During the summer months, numerous 

 tests were conducted, and In September the apparatus was set up at one of the 

 Ontario Paper Company's camps about 50 miles north of Heron Bay* 



Due to the special feat\ires Incorporated In the design of this apparatus | 

 the oil extraction time was reduced from six to four hours* 



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