BLUE-FOX FAKMING IN ALASKA 
13 
construction and operation of the trap itself is given in Figure 17. 
Foxes arrive at the entrance to the chute (1) by means of a sloped 
board (2). The trap floor pieces 3 and 3' are pivoted at 4 and 4', 
respectively. To make them reset automatically, counterweights (5 
Fig. 13. — An excellent type of trao-feed house, trap for which is detailed in Figures 
15 to 17 
and 5') are placed on the lower side at opposite ends of the floor 
pieces. Floor piece 3 is securely locked and supported by the square 
notch (6) portion of the trigger (7). Floor piece 3' rests lightly on 
the beveled (8) portion of the trigger (7) so that the weight of the 
FIG. 14.- 
-Trap house in which the foxes eat on the second floor and when the trap 
is sprung fall to the floor below 
fox's front feet on the ends of the floor piece 3' depresses the board 
and forces outward the entire trigger, thus releasing the floor piece 
(3) from the support (6) portion of the trigger. Floor piece 3, 
with the weight of the hind part of the fox, and floor piece 3', with 
