ck to be excavated. Itis pent-up forces beneath, and forced upwards into a vertical gland is tightened by bolts furnished with countersunk col- position, like the jaws of a monster, broad at the base and a new machine of this latter class, patented by Mr. F. T. Hen- lars, so that they serve also to… … HENLEY’S ROCK-TUNNELING MACHINE. This tunneling machine may be described briefly us a hor- the chimney, through which pour volumes of steam and thrust of the piston, when delivering a blow, throws no strain izontal steam—or compressed air—hammer, having a head smoke, roaring flames and lava, with…
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