An Effective Mouse-frop. 
A 
THE am. 
3J 
«0 
3 
Next wc must makt; 
a kind of a grid, a little 
narrower from side to si Ic 
than tlie interior of the 
box. It is shaped thus 
(vide fig.)— it extreme - 
iy roughly made and must 
he light and constructed of 
wood . 
Finally we need a 
peg about Sins, long, with 
a point at one end and a 
knife-edge the other. 
If we fasten the front door of our trap; throw any 
odd seed, dog biscuit or cheese inside the box, we ciin then 
set the trap. 
The "Grid" is introduced into the box, the lid being 
raised so that the part A.B. is uppermost (this is importantj 
and the end B. resting on the floor post about half to three-quart- 
ers of an inch from the end of B. The peg mentioned above is 
then placed on the extreme end of B.; the lid is gently allowed to 
drop on to the 
pointed end of the 
peg and the trap is 
set. 
I have sket- 
ched very diagram - 
matically the essen- 
tials of the trap. It 
will be noticed that 
we have here the 
lid balanced by the 
grid in a state of 
unstable equilibri- 
um. The raoufce 
jumps on to the grid, 
upset's the balance, down drops the peg and the lid falls on to the 
ledge. 
It is so simple and certain that it never fails; but, 
certain points must be observed. One is, the box must be 
large and thus in no way suggest a trap. Mice cannot keep 
7^ 
FLOOR 
