L'enregistrement ; un recueil du progrès scientifique et de la découverte . est condensée, et le vide créé dans lequel lavis est forcé par la pression atmosphérique et à capillaire-traction. Général Gillmore pense qu'une plate-forme en bois créosoté soigneusement,, durerait vingt à trente ans, et être mieux qu'une plate-forme en pierre au cours de cette entireperiod. 302 ENREGISTREMENT DE LA SCIENCE. Nouveau sol incombustible. Dans cette invention, M. Nathaniel Cheney, de l'Archi-tectural Iron Works, New-York, l'inventeur, pro-pose de lattes et autres matières combustibles, buildingmaterial et appliquer le plâtre, plafond de prix

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The Science record; a compendium of scientific progress and discovery . is condensed, and a vacuum formed into which theoil is forced by atmospheric pressure and capillary at-traction. General Gillmore thinks a wooden platform, thoroughly creosoted, would last twenty to thirty years, and be better than a stone platform during that entireperiod. 302 SCIENCE RECORD. NEW FIREPROOF FLOOR. In this invention, Mr. Nathaniel Cheney, of the Archi-tectural Iron Works, New-York City, the inventor, pro-poses to do away with lath and other combustible buildingmaterial, and apply the plaster, for ceiling rooms, directlyto iron wire, which is interwoven with the tie-rods of flooror roof arches. In our engraving, the arch A is formed of metal platesbolted together at the edges by angle-bars, and resting atthe ends on metal skew-back beams B, which are tied to-gether by wire rods C, to prevent end-pressure or strainon the walls, and hold the arch up stiff and firm. On thelower floor, the arch is made of brick, and is similarly se-cured, supporting a layer of concrete above.. NEW FIREPROOF FLOOR. The connecting or tie-wires C are arranged close toge-ther, as shown in the section, Fig. 2, and small wire iswoven in at suitable distances. The fabric is suspendedby the short rods D from above, and upon it the plasteris applied in the ordinary manner. The device is neces-sarily fireproof, is said to form firm floors, and preventsthe transmission of sound. MECHANICS AND ENGINEERING. $05 EXPERIMENTS ON THE RESISTANCE OFSTONES TO CRUSHING. Mr. C. B. Richards, C.E., has experimented upon va-rious kinds of American building stone worked into i-inchand i^-inch cubes, with flat and smooth faces. The specimens were crushed between the plane facesof two hardened steel hemispheres, the curved portions ofwhich were seated in corresponding cavities of steel blocks, fixed in the machine. Single thicknesses of lace leatherwere interposed between the stones and metal surfaces ;thus the pressure was uniform

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