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03 ... . . . * L = 24 ins. with gradual load. . 05 25 RUSSELL ON TESTING MATERIALS BY IMPACT b = the width of beam. All dimensions are in inches. Then, by computation, when 103 is the weight of the hammer in pounds, the resilience in inch-pounds per cubic inch of the material, or 103 [ F - (S + C1)] Rl = Lhb Table 19 shows a series of observations just as they were recorded by the observer, and extended in the office. The resilience by gradual load was obtained by breaking the bar in a standard testing machine and accurately measuring the deflections up to the point of rupture.

10 was found to give better results with very tough wood or metal. Fig. 11 is the same as Fig. 10, but with the section reduced as in Fig. 9. In the last two forms, the hammer strikes the bar at the side of the smaller nick. Table 8 shows the results of nicked tests made with cast-iron. The values given in the last column show that the metal was all of equal toughness. The observed values, given in the column next to the last, indicate that the resilience per square inch of section is not constant for varying depths of section.

Table 3 shows that a flat bar has about the same resilience whether broken flatwise or edgewise. All these bars were cast from the same melt. In the case of a bar 2 ins. wide and 1 in. thick, it should have, when broken edgewise, twice the strength and half the maximum deflection that it would have flatwise. The error from yielding supports and from indentation should be about four times as great in the former position. The error from inertia of bar should be the same in both cases. It would be expected that the bars would show greater resilience when broken edgewise.

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Abrasion and Ablation of Heavy Ions

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