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