Bui. 1061. U. S. Dept. of Agriculture. 
PLATE VIII. 
Chipping at about the midseason of the second year's working. This represents average good 
practice, but a single piece of iron is being much used instead of two bent gutters. At the rate 
of one-half inch at each streak, the face moves up the trunk about 16 inches a year. Including 
the high face, this permits of 6 to 8 years' working. 
