Word: size
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Dates: during 1900-1909
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...carried on in the engineering laboratory of the Lawrence Scientific School under the direction of Mr. S. W. Page is of a very interesting character. The three principal tests so far developed are upon the resistance to wear, relative toughness and cementing value of various stones. Fragments about the size of those used on roads are inclosed tightly in a diagonally pivoted iron cylinder which is rapidly rotated for five hours, the motion throwing the stones from one end of the cylinder to the other and subjecting them to both wear and impact. The relative toughness is determined on small...