FORMATION OF PIPE. 



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PLAN OF DECOY-PIPE. 



decreases to the end, where the fixed part terminates 

 in a width and height of two feet. Here a 

 detachable tunnel- net is hooked securely to it, and 

 continues its shape ; it is kept open by light ash 

 hoops ; it may be nine feet long, and taper to a 

 point ending in a loop that hooks over a peg in the 



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