I claim tumbler, F, with its pin, G, in combination with dog, H, with its slot, I, substantially as and for the purpose described. 71,964.--VENTILATOR FOR BUILDINGS.--Thomas Boyd, Cambridgeport, Mass. I claim, 1st, The combination of the chamber, A, with or without the lenses, B, cone, C, and rods, D, constructed and arranged to operate substantially as and for the purpose set forth. 2d, The combination of the oscillating cap, K, and elastic pads, I, substantially as and for the purpose set forth. 3d, The arrangement of the chamber, A, cone, C, pipes E and H, and cones, G and K, substantially as set forth. 71,965.--DOOR LATCH.--Purmort Bradford (assignor to Sargent & Co.), New Haven, Conn. I claim the construction of the latch bolt with the pivot bearings, a and b, upon opposite sides combined with a single central pivot upon the plate so as to be adjustable for a right or left-hand door and the said plate constructed with a slot through which the latch is operated, in the manner herein set forth. 71,966.--PLOW.--Harvey Briggs, Smithland, Ky. I claim, 1st, Forming the land side, mold board frame and upper and lower strengthening floors, b1 and b2, solid in one piece B, substantially as herein shown and described and for the purpose set forth. 2d, The combination of the conical rollers, D, and their boxing frame, H, with the mold board frame, B, substantially as herein shown and described and for the purpose set forth. 3d, Forming the boxing frame, H, in two parts, substantially as herein shown and described and for the purpose set forth. 4th, forming an oil trench or channel, J, in the boxing frame, II substantially as herein shown and described and for the purpose set forth. 5th, The combination of the elastic washers or packing, I, with the journals and bearings of the rollers and wheels, substantially as herein shown and described and for the purpose set forth. 6th, The combination of the adjustable friction wheel, F, and stationary friction wheel, E, with the solid hand side and mold board frame, B, substantially as herein shown and described and for the purpose set forth. 7th, The combination of the vertical flanged friction roller, G, with the land side of the plow, substantially as herein shown and described and for the purpose set forth. 71,967.--PIANO STOOL.--Josua Briggs, Peterboro, N.H. I claim, in combination with the pillar and feet, the socket block, m, having recesses formed with side lips or flanges, o, to fit into groves, q, in the feet and bottom seats, p, between which and the shoulder on the pillar the feet are securely continued, substantially as described. Also the center piece, w', fitting upon and covering the screw bolt and nut which confine the pillar to the base, substantially as shown and described. Also constructing the socket block, m, with a center socket, t, into which the tail piece of the pillar fits and is confined, substantially as described.