Angles of a Trout's Vision 



300 degrees; this refers to objects on 

 the horizontal plane of the eye of the 

 fish. There will remain then an arc 

 of invisibility behind the trout of about 

 60 degrees. 



Fio. 9 



The eyes of the trout are at T; A T B and B T C are angles of 30 de- 

 grees each. A B C is an arc of 60 degrees and is the zone of invisibility 

 of objects on the same horizontal plane as the trout. 



When the angler is wading, naturally 

 his rod and the upper part of his body 

 are above the horizontal plane of the 

 trout, and they may come within the 

 vision of the fish at a certain point 



[143] 



