Coal Mining Kinks: Compiled From the Regular Issues of Coal Age (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Coal Mining Kinks: Compiled From the Regular Issues of Coal Age

This difficulty may be overcome by sharpening the drill as shown in Fig. L, where, it will be seen, the corners have been turned back so that the cutting edge assumes a curved outline. Such a drill point as this will not wedge in ordinary cracks and will thus prevent sticking.

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