Abstract
To the freshmen of the lower secondary schools, practice in polishing plane iron edges helps to the improvement of their wood manufacturing techniques such as the handling of wood-working machines and the planing of metals. On this ground, we practiced the beginners in polishing plane iron edges. Next we tested the sharpness of the blades they had polished, and examined the state of the blades by measuring their cutting force. Those experiments proved that the freshmen had been successful to some degree in polishing. On this paper are reported the data obtained through the experiments made for the improvement of the teaching method of wood manufacturing.
