Craftsman 917.272351 Owner's Manual page 55

SUGGESTED GUIDE FOR SIGHTING SLOPES FOR SAFE OPERATION
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1, Fold this page along dotted line indicated above,
2, Hold page before you so that its left edge is vertically parallel to a tree
trunk or other upright structure.
3. Sight across the fold in the direction of hill slope you want to measure.
4, Compare the angle of the fold with the slope of the hill,