n. ber inclosing the upper end of the base or sup- : —_ 0 THE INGERSOLL DUPLEX ROCK DRILLING MACHINE. port. The top plate, to which the fire box and oven IMPROVED LEAD PIPE REEL, are joined, is provided ;with a hollow ball, open at Lead pipe is usually put up on reels’ which do not collars above… … stove. The base forms the chimney of the stove, and the drill against the resistance of the spring. When is connected at its bottom with a horizontal pipe which the shaft cranks pass over center, the spring drives the nected by slats, which: must be knocked off before the drill into the rock with…
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