I claim the combination of the semi-cylindrical box, D, segment, W, pinion P, parts, m m', lever, H, and ribs, r, as herein described, for the purpose specified. 72,053.--DOOR-FASTENER.--Francis C. Levaliey, Warnerville, N.Y. I claim the sliding wedge bolt, F, in combination with the sliding spring catch, K, and cases, E J, as herein described, for the purpose specified. 72,054.--CONDENSING ENGINE.--William A. Lighthall, New York city. I claim the arrangement of the ordinary jet condenser, B, air pump, D, and hot well, E, with the surface condenser, F, and the valves, H K, and L, as shown and described, so that the change from the use of the jet condenser can be made at will, and _vice versa_, 73,055.--MACHINE FOR FORMING AND TEMPERING ELLIPTIC SPRINGS.--Geo. S. Long, Bridgeport, Ct. I claim, 1st, A steel spring former, substantially as shown and described, and for the purposes set forth. 2d, The vibrating rod, B, and shoe, f', and any former, F, in combination with the slotted wheel, W, and roller, W', substantially as shown and described, and for the purpose set forth. 3d, The hollow shaft, s', and roller, W, in combination with the binder or presser, D, substantially as shown and described, and for the purposes set forth. 4th, The sliding crank pin, p, in combination with the slotted wheel, W, and slotted vibrating rod, B, substantially as shown and described, and for the purposes set forth. 72,056.--FURNACE FOR HOT AIR BLAST.--Richard Long, Chillicothe, Ohio. I claim, 1st, Constructing the air pipe of a furnace-blast heater of fire clay, substantially as described. 2d, Constructing the air pipe of an oval or other equivalent form, and uniting the sections of which it is composed by socket joints, with clumps and keys, substantially as shown and described. 3d, Forming the supporting walls, B, of firebrick, with iron plates between the courses, substantially as shown and described, 4th, Placing an open or a solid plate beneath the air pipe, substantially as and for the purposes herein described. 72,057.--CLOTHES RACK.--Eugene F. Lyman, Indianapolis, Ind. I claim the combination and arrangement of the semi-circular racks G and H, the arms, f and c, the sockets and staples for the arms, and the box, A B C D, all operating substantially as and for the purpose specified. 72,058.--CENTER BOARD FOR VESSELS.--E. J. McFarlin, San Francisco, Cal. I claim the location of the center boards, or other equivalent devices for the same specific purpose, in the extreme bow and stern of vessels, that is to say, the placing of the said boards forward of the foremast or aft of the mainmast, in two masted vessels, and forward of the foremast and aft of the mizzen mast in three masted vessels, substantially as shown and described, and for the objects and purposes specified. 72,059.--REGISTER POINTS FOR PRINTING PRESS.--E. W. McGowan, New York city.