. Bulletin . tones are at rest. The larger stones are usually shaped into circular form beforethey are placed in the lathes. In southern Ohio they are cut out inthe quarries with circle-cutting drills, while in northern Ohio theyare quarried out as cubical blocks and scabbled to circular faces and sides of the stones are trimmed by holding a baragainst them as they rotate. Plate Yl, A, illustrates the method ofshaping a 7-foot stone. The row of upright pins on the timber baseare for the purpose of holding the cutting bar in various workmen may stand on either side, and i
. Bulletin . tones are at rest. The larger stones are usually shaped into circular form beforethey are placed in the lathes. In southern Ohio they are cut out inthe quarries with circle-cutting drills, while in northern Ohio theyare quarried out as cubical blocks and scabbled to circular faces and sides of the stones are trimmed by holding a baragainst them as they rotate. Plate Yl, A, illustrates the method ofshaping a 7-foot stone. The row of upright pins on the timber baseare for the purpose of holding the cutting bar in various workmen may stand on either side, and if two men are employedboth sides of the stone may be trimmed simultaneously. Grindstone lathes are operated by steam, electricity, gasoline, ornatural-gas engines, the choice of power depending upon relativecosts and availability. Most lathes are provided with suction pipes in the pits to carryaway the dust, and thus reduce the danger of its injurious effects uponworkmen. BUREAU OF MINES BULLETIN 124 PLATE VI. .1. METHOD OF SHAPING A 7-FOOT GRINDSTONE IN A LATHE.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
