...The trap should be fitted with a chain about three feet in length, with a two prong drag attached, but most trappers simply wire a stone of eight or ten pounds weight to the end of the chain... 
Elmer Harry Kreps 「Science of Trapping」
...The prong projecting backward at the angle of the main beam is by nomeans so uncommon in the animals of this region as a Chipewyan hunterseemed to indicate to Downes (1943: 227-228)...
Francis Harper 「The Barren Ground Caribou of Keewatin」
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