I claim the application of detachable wings to a sky rocket, through the medium of a collar or band, arranged so that the wings may be detached from the collar or band, or the latter detached from the rocket, substantially as shown and described. 72,030.--SKY ROCKET.--John W. Hadfield, East Williamsburg, N.Y. I claim the attachment to a sky rocket of three or more sticks, at equal distances apart, substantially in the manner and for the purpose set forth. 72,031.--MACHINE FOR REFITTING CONICAL VALVE.--Chas. F. Hall, Brooklyn, N.Y. I claim, last, A milling tool with one or more cutters attached to one or more arms or longitudinal sections of a cone, whether straight or oblique, whereby conical valves of different sizes may refitted, constructed substantially as shown and described. 2d, In combination therewith, the yielding center, C, substantially as described. 72,032.--COLLECTING OXIDE OF ZINC.--Geo.C. Hall, Brooklyn, N.Y. I claim, 1st, A building, structure, or compartment, A, provided with openings, a, covered by screens, B, substantially as and for the purpose set forth, 2d, A screen for separating the oxide of zinc from the fumes and gases of burning zinc ore, composed of ground cork, hair, wool, sponge, or other suitable or similar material, confined within a suitable chamber, substantially as set forth. 72,033.--REGISTER FOR ODOMETERS.--Henry F. Hart, New York City. I claim the arrangement in an inclined position of the counting wheels, 1, 2, 3, 4, 5, and 6, upon shafts of equal lengths, in combination with the notched and perforated lid, B, as herein shown and described. 72,034.--NECKTIE.--Wm.H. Hart, Jr., Philadelphia, Pa. I claim a bow or tie, A, having an elastic loop or cord, B, arranged horizontally at its rear, with both of its ends free, for the purpose substantially as described. 72,035.--ELLIPTIC CARRIAGE SPRING.--Horace R. Hawkins, Akron. Ohio. I claim an elliptical carriage spring composed of a single piece, F, or two separate pieces, E E, of steel, united by means of blocks and bolts, substantially as herein shown and specified. 72,038.--HATCH-LINING DRAWINGS.--E.K. Haynes, Hanover, N.H. I claim a straight-edge or scale having a mechanism for effecting an intermittent movement of the same, substantially as described. Also in combination therewith the tongue, q, tor angular lining, substantially as described. Also in combination with the feed mechanism, a mechanism for presenting the straight edge in positions radiating from a center, substantially as set forth. 72,037.--PLATFORM SCALE.--D. Hazzard, Milton, Del. I claim the Hollow stand, A, the spindle, C, the springs, D, the elastic rod, G, and the graduated plate, H, in combination and arranged substantially as shown and described tor the purposes set forth. 72,038.--PIANO LOCK.--Adam Helmstaedter, Newark, N.J.