The inner sides of the teeth are softer and wear away faster than the outer, so that the bevel remains the same; and the action of the upper and lower teeth over each other keeps them always sharp.
"Ways of Wood Folk"
William J. Long
There are two of these in each jaw, extending a good inch and a half outside the gums, and meeting at a sharp bevel.
"Ways of Wood Folk"
William J. Long
G1 Coiler Driving bevel Gear, 20 Teeth.
"Illustrated Catalogue of Cotton Machinery"
Howard & Bullough American Machine Company, Ltd.