Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 58
les of the clamps and twiststhe rope a little. This slight twisting of therope at the top turns the drill a little for eachblow, though the point of the drill is hundreds or,it may be, thousands of feet below. And thisturning is necessary to keep the hole round andtrue, and to prevent the tools… … EVERY TIME THE DRILL IS RAISED FOR A BLOW, THE DRILLER CATCHES THE HANDLES OF THE CLAMPS AND TWISTS THE ROPE A LITTLE. The drillers watch the cable, and. as they see bythe length unreeled that the drill is near thebottom, they check its speed, and stop it as ittouches. The drill must be raised a…
Children's literature
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