Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 234
es wide and sixinches deep. The clay was caught by a con-veyor that carried it through the concrete-block-laying machine back to the laborers, where it wasloaded upon cars and hauled out of the tunnel.Electric motors were used to operate the tunnel- (Ttf ie continueii.) ing machine, as well as the… … THE GI.\NT AUGER BORING .\ HOLE TWELVE FEET IN DI.^METER. We have to pick the rock out of the way,explained Mr. Palmer, or we might even haveto break it up with a bit of powder; but we dontexi)ect to run across many boulders in this bedof clay. I wish there were some way of cuttingthrough rock in…
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