peculiar harder material. On exploding the cotton with the torpedo station at Newport, R. I., with cylinders of effect is only produced by the surface of the gun cot- face thus prepared in contact with the iron, the grooves compressed gun cotton. The reproduction, by the are reproduced in intaglio… … It was of interest to determine ed into cylinders (Fig. 7) or cubes TESTS OF aUALITY OF IRON AND STEEL. with truncated corners (Fig. 8). if a soft body could produce an impression upon iron. Between two plates a cou- One of the cylinders is also shown in the cut below, The little projecting fibers…
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