Iron ores, salt and sandstones . mportant to determine the transverse orcross breaking strength. This is an important test oftenomitted, but stone is sometimes found with good compres-sion and low transverse strength. Such stone suitable forordinary building construction, would have a low value forwork when the stone is supported at the ends and weight ap-plied near the center. Usually too little attention is giventhe strength of stone for such uses, the stone being selectedfor color or low cost. It would be better if more attentionwas given in buildings to the transverse strength of stonecaps
Iron ores, salt and sandstones . mportant to determine the transverse orcross breaking strength. This is an important test oftenomitted, but stone is sometimes found with good compres-sion and low transverse strength. Such stone suitable forordinary building construction, would have a low value forwork when the stone is supported at the ends and weight ap-plied near the center. Usually too little attention is giventhe strength of stone for such uses, the stone being selectedfor color or low cost. It would be better if more attentionwas given in buildings to the transverse strength of stonecaps, etc. The stone for this test was cut in the form of slabs orprisms 4x6x24 inches. These were made even and smoothon a rubbing bed and rested on end supports 19 inches apart,then loaded at the middle over a bearing one inch wide, theload increased until the slab was broken (see figure 14). 2. U. S. Arsenal, Tests of Metals, etc., 1894, pp. 387, 389. 3. U. S. Arsenal, Tests of Metals, etc., 1895. WEST VIRGINIA GEOLOGICAL Fig. 14. Diagram showing arrangement of stone prism for transversestrength determination. The modulus of rupture was obtained from the followingformula :4 W=—tt^ R from which K 3 Iy 3 L r W 2 b d W=concentrated load at center in pounds. B=breadth in inches. D=depth in inches. L=length in inches. R=modulus of rupture in pounds per square inch. The following table shows the results of some of thetransverse tests made at the U. S. Arsenal: 4. Buckley, Wise. Geol. Survey, Bull. IV, p. 62. 544 EXAMINATION AND TESTING OF BUILDING STONE. I/KAWTY Milford, Mass. granite Rockport, Mass. granite Dekalb, N. Y. marble Junction City, Kansas, limestone Jasper, Alabama, sandstone Little Rock, Ark. sandstone Redfield, Kansas, sandstone Olymphia, Wash, , Oregon, 191920202020202020 II u 4 m Q5 Ultimate Strength TotalPounds 9,020 12,320 5,440 2,730 9,120 11,990 10,
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