I claim the clamps, D, the treadle, E', the arms, E, springs, F', and rods, F, constructed, arranged, and operating, in combination with the stationary part, A, substantially as shown and described for the purpose set forth.
71,999.--CARRIAGE FOR ROCK DRILL.--Thomas Doane, Boston, Mass. I claim the arrangement of the round bars, E F G and H, of a rock drill carriage into a frame, for the reception of rock drilling machines which shall be able to reach therefrom any point where it is desirable to bore a hole, substantially as and for the purpose described.
2d, The position of the horizontal round bars, E and F, under an acute (more or less) angle, d, to the side frame of a rock drill carriage, or to the alignment of the tunnel, substantially as and for the purpose set forth.
3d, The construction of a rock drill carriage for driving a tunnel or mine so as to swing in a vertical direction on the forward wheels and axle, substantially as and for the purpose specified.
72,000.--RAILWAY CHAIR.--John H. Downing, Salem, Mass.
I claim the single-headed chair, A, in combination with a sectional railroad rail, arranged as and for the purpose shown and described.
72,001.--ROTARY PUMP.--John Doyle, Hoboken, N. J., and Timothy A. Martin, New York city.
We claim the two drums, A C, placed concentrically one within the other, the chamber, D, air passages, E E', valves, F G, and tubular journals, B B', all arranged and combined to operate in connection with water or other liquid placed in the space or spaces between the two drums, A C, substantially in the manner as and for the purpose specified.
72,002.--GRINDING MILL.--James F. Drummond, New York city.
I claim the tubular inlet-journal, b, having its interior contracted around the feed pipe at one point, and thence flaring toward the cylinder and the blast pipe, substantially as and for the purpose specified.