This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
When using a grindstone, an ample flow of water is desirable in order to insure good cutting, and the objectionable spattering may be overcome by fastening a piece of leather to the grindstone frame so that its edge will bear lightly upon the stone just below the point where the work is held. This will scrape off all surplus water from the grinding surface and prevent spattering. - Contributed by Thos. L. Parker, Wibaux, Mont.