Bui. 1061, U. S. Dept. of Agriculture 
Plate VI 
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. 
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