Bui. 115, U. S. Dept. of Agriculture. 



Plate I. 



t y-N Hook mad 

 2" < ^P)) flatlene 



■*< 5'- 6" 



- 



Ler7 hand square 5td 

 thredds,--L Inch pitch. 



I*- 8'— 



1 



:*-Key. 



i2' ash or f~ 



hickory pole. V F 



J 



jWts 



& 3 4 



*/* 



% 



t-'-i- V =3 



*Yr|L-» % Was 



Vz „ 





