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It will now be readily seen that the slightest weight on either end of the treadle-piece within the trap must tilt it to one side, thus throwing the pivot-piece from its bearing on the spindle; and the latter being released, lets fall the weight with crushing effect upon the back of its hapless victim. The trap is very effective, and is easily constructed.
A stout staple should be driven in the centre of its upper face, and from this a stout string should be passed upward through a hole in the centre of the box. The parts are now adjusted, and even in the present state the trap is almost sure to spring at the slightest touch on the treadle-piece. An additional precaution is advisable, however.
These holes may be bored with a gimlet or burned with a red-hot wire. This pivot should project an inch from the wood, and should be firmly inserted in the treadle-piece. The platform being thus arranged, proceed to fasten the boards together, as shown in the illustration, the top and bottom boards overlapping the others.
Passing beneath the suspended log, his heavy paw encounters the broad board on the treadle-piece, which immediately sinks with his weight. The upright pole at the back of the treadle is thus raised, forcing the latch-piece from the notch: this in turn sets free the side pole, and the heavy log is released falling with a crushing weight over the back of hapless Bruin.
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