...You cut a stake, sharpen it at one end, cut it about 15 inches long, about 1 inch in diameter; leave a prong about three inches long and about three inches from top to stake down trap... 
A. R. (Arthur Robert) Harding 「Fox Trapping」
...The long trigger should have a short prong left or a nail driven in it to prevent the game from getting the bait off too easy...
A. R. (Arthur Robert) Harding 「Mink Trapping」
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