. Bulletin of the Department of Agriculture. Agriculture; Agriculture. r 28 BULLETIN 704, U, S, DEPARTMENT OF to the axis of the cyliuder as it is pos- sible to make it. After drying and cool- ing, a specimen to be tested is placed on the anvil (W) of a Page impact ma- chine, shown in figure 2, taking extreme care that when in position the specimen rests with a perfect bearing on the anvil and that the spherical end of the plunger is tangent to the specimen exactly in the center of its upper surface. The small thumbscrew used for separating the clips which hold the specimen
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. r 28 BULLETIN 704, U, S, DEPARTMENT OF to the axis of the cyliuder as it is pos- sible to make it. After drying and cool- ing, a specimen to be tested is placed on the anvil (W) of a Page impact ma- chine, shown in figure 2, taking extreme care that when in position the specimen rests with a perfect bearing on the anvil and that the spherical end of the plunger is tangent to the specimen exactly in the center of its upper surface. The small thumbscrew used for separating the clips which hold the specimen in place should be so adjusted that the clips hold the test piece firmly without any undue pressure on the spring. Attention to these details is very important if accu- rate results are to be obtained. When the specimen is in position the current is turned on the magnet and the upper cross-head is lowered until the rod pro- jecting from it just comes in contact with the rod projecting from the lower cross-head (M). This occurs at the in- stant the pilot lamp, in series with the magnet circuit, flashes out. The dial (Q) is then adjusted to O, the upper cross-head raised 1 centimeter, and the motor started. After each blow the fall of the hammer is increased 1 centi- meter until failure of the test piece occurs. The height in centimeters of the blow at failure is recorded as the toughness of the material, using for the final value the average of three determinations. In the case of foliated rock the average of three determinations in each direction is taken as the toughness of the sample. "Weight per Cubic Foot of Broken Slag.—The weight per cubic foot should be determined by shaking the dried slag to refusal in a cubic foot cylindrical measure. About i of the total amount of slag necessai'y to fill the measure is first introduced in such a manner as to avoid any separation of sizes. This ma- terial is then shaken down by rocking the measure from side to side until no furt
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