and let it dry. Then harden by heating the point bright red and dipping into cold water. The compound may then be brushed out with a file card. This leaves the file very hard and brittle, so use it carefully to prevent breaking. The compound is used merely to prevent the heat from forming "scale" on the edges of the teeth.
Figure 18-E shows an ingenious checking tool designed and made by Mr. John Crowe of St. Joseph, Missouri, while Figure 18-F shows a modification of the same tool which I made after seeing Mr. Crowe's. This tool, by reason of the single edge cutter may be shaped up very accurately. The guide is pivoted at the rear, with a small coil spring which forces the edge of guide below cutting edge normally, but permits the cutter to be pressed down onto the wood against the tension of the spring. The guide thus rides in the last cut, keeping the cutter in line and parallel with it. This one tool is used both for the preliminary spacing and for the finishing of the diamonds, and docs a good job. I found Mr. Crowe's device a little awkward at first, as I am accustomed to using longer tools. Thia of course is only a matter of habit, and what we are used to. The longer cutter ■with narrower blade gave me better results; and while only time and use can show the possibilities of a checking tool, I would not be surprised if this should make a convert of me in the course of time, , . , , .
SPECIAL KNIVES, SCRAPERS, ETC. Make these as needed from hacksaw blades, harden and temper in oil. Knives having
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