brief note on granite quarry

Oct 31, 2007 A plug or steel wedge was placed between them and driven in with a sledgehammer until the rock split. Note the row of holes along the edge of the split rock at the lower left of the photo. (Detail of the Waltersville quarry photo, Granite MD) [closeup picture of the Waltersville quarry] The Quarrymen. Hardy men labored in the quarries at work ...