83, the bevel already obtained on the grindstone being made slightly more obtuse at the edge.

A good method is to rock the gouge on its axis with the left hand, while the slipstone held in the right hand is rubbed back and forth on the edge.

Then the concave side is rubbed on the round edge of the slipstone, care being taken to avoid putting a bevel on it.

Inside bevel gouges need to be ground on a carborundum or other revolving stone having a round edge.

The outfit of the agacite grinder, (Fig.