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A rock-drilling machine may be excellently invented and in the most perfect order except for a want of hardness in the drill, and yet there will remain an unpierced rock as obdurate as the general public to so many of our innovations.
"You like to work, don't you?" she went on at last as he stood sweating and dumb in her presence, "don't you ever get tired, or anything?" "Not doing this," he said, "I'm a driller, you know, and I like to keep my hand in. I compete in these rock-drilling contests." "Oh, yes, father was telling me," she answered quickly. "That's where you won all that money the money to buy the mine."
This compressed air may easily be led in pipes to the face of the heading, and used there to drive the small engines which work the rock-drilling machines, etc. The efficiency of such machines is doubtless low, chiefly owing to the physical fact that the air is heated by compression, and that much of this heat is lost while it traverses the long line of pipes leading to the scene of action.
Hoe's printing-press, moved by steam, seizes on the blank paper, severs it from the roll in sheets of the right size, prints it on both sides, and folds it in a convenient shape, all with miraculous rapidity. Inventions in rock-boring and rock-drilling have made it possible to tunnel mountains.
They'll start you rock-drilling at the Tyee, but it's quite likely I'll send you up into the ranges prospecting by and by. Still, I don't want any of the folks down here to know you're with me, and you'll start out by the railroad trail to-morrow, and wait at the lake until I come up with you. There's somebody coming now!"
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