The grinding should continue until the ground surface reaches the cutting edge and there is no bright line left along the edge.

If the grinding is continued beyond this point, nothing is gained, and a heavy wire edge will be formed.
A very convenient and inexpensive grinding tool, Fig.

224, sold as the "_Agacite grinder_,"[7] has a number of different shaped grinding stones made chiefly of carborundum.
The _oilstone_.

After grinding, edge tools need whetting.

This is done on the whetstone, or oilstone.