2d, The solid double headed lifter, C, in combination with the flexible diaphragms, c and d, and the primary and secondary reservoirs, substantially in the manner and for the purpose as herein set forth. 3d, The transmission of the pressure of steam from one column to the other by means of a solid double headed lifter, in combination with the flexible diaphragms, c and d, substantially in the manner and for the purpose as herein set forth. 4th, Providing the primary reservoir, I, with the screw plunger, H, substantially in the manner and for the purpose as herein set forth. 72,024.--MACHINE FOR WALL BUILDING AND STUMP EXTRACTING.--Thomas S. Greenman, Mystic Bridge, assignor to George W. Packer, Jr., Mystic River, Conn. I claim, 1st, The within described novel construction of a truss for a wall building machine, the same consisting in the pyramidal framing, A B B, the horizontal timbers, D D, uprights. E F, holding-down bolts G J, and inclined braces, I H, combined and arranged substantially as and for the purpose herein set forth. 2d, Also in such truss firmly securing the timbers, D D, to the pyramidal framing, A B B, by enlarging and bolting, or equivalent fastenings, at the points of contact, in addition to the truss work before described, substantially as and for the purpose herein specified. 3d, Also the diagonal arrangement of the holding-down bolts, G, at the front of my truss, the same being arranged relatively to the timbers, D, triangular frame, A B B, and their several connections, substantially in the manner and for the purpose herein set forth. 72,025.--WINDOW SCREEN.--A.W. Griffith, Roxbury, Mass. I claim the roller cover, E, in combination with the removable screen, D, spring roller, C, sash, A, and window frame, as herein described for the purpose specified. 72,026.--FERTILIZER.--Wm.C. Grimes, Ladiesburg, Md. I claim forming a fertilizer in the manner herein described, of the ingredients and proportions substantially as specified. 72,027.--CULTIVATOR.--John Gross and John C. Tunison, Decatur, Ill. We claim, 1st, the arrangement and combined action of the two frames, so that when any permanent obstruction comes against any of the plows the frames will disconnect, and the back frame ride or move up on the front one and thus avoid breakage, substantially as described. 2d, Also a frictional spring hook upon the tongue or tongue frame, for catching or holding upon a cross bar of the rear frame so that the two frames will not disconnect until the pressure upon the plow or plows exceeds that for which the hook has been adjusted, substantially as described. 72,028.--HOSE SHIELD.--John A. Hasse, Philadelphia, Pa. I claim the combination of the floor or footway, C, with the side pieces, b b, of a sectional hose bridge, constructed substantially as described. 72,029.--SKY ROCKET.--John W. Hadfield, Newtown, N.Y.