Three-leaf clover -- built on the same general 
principle, but with three leaflets on a central triangle. 
Measurements: triangle, 24"x24"x24"x 11" high; leaflets

as for four-leaf clover. (24 chickens) 
Falling Door (30 chickens) 
A single-catch trap, useful in poor trapping weather. 
Designed by the Hamerstroms in 1938-39. Trap is a cubical 
frame about 18"xl8"fxl" covered with seine except for the

front, which is a vertically falling door. Set with a 
figure-4 trigger, or a modified figure-4 as follows: one 
end of a stick laid on top of trap, front to back, holds 
up the door; at back end of stick attach a string, which 
runs down into the trap near the back; attach a twig to 
the lower end of the string; lay the twig length-wise on 
an ear of corn on the ground, lay a second ear cross-wise 
with one end on the twig and the other on the ground. This 
arrangement worked better than the figure-4, as birds 
walking around the trap often tripped the standard figure-4 
by striking against the projecting elbow. Birds can be 
taken out the entrance door, or through a smaller take-out 
door. 
Ground Net (2 sharptails, 24 chickens) 
Two half-ovals of heavy wire, whose /ends are inked 
together to form hinges. Lay the frames flat, spread open, 
and cover with seine ; cut the seine wider than the width 
of the frames. To set, staple one frame A to the ground