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The machine adapted as a tool-grinder has six emery-wheels for varying characters of work. Four are assorted for gauges of different radii, for moulding-irons, etc. One has a square face for plane-irons, chisels, etc. One is an emery hone to replace the water-of-Ayr stone.
It is no small advantage merely to save leather for other uses, since leather is an article of which the supply is strictly limited. It is not uncommon for India-rubber belts to be furnished, which, if made of leather, would require more than a hundred hides. Emery-wheels of this material have been recently introduced. They were formerly made of wood coated with emery, which soon wore off.
The emery-wheels of Thompson, Sterne & Co. of Glasgow have the same variety of form and application usual with us, but the firm claims that while it uses the true corundum emery of Naxos, the American article is only a refractory iron ore, which soon loses its sharpness and becomes inefficient. This is a question of efficiency or of veracity which we leave to the trade.
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