Report on the Compressive Strength, Specific Gravity, and Ratio of Absorption of the Building Stones in the United States (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Report on the Compressive Strength, Specific Gravity, and Ratio of Absorption of the Building Stones in the United States

Each specimen of all the kinds was carefully prepared by an expert stone-cutter, and the bed-side marked. These were then placed upon a table near the hydrostatic-press, used in such a manner as to mix them completely, and so prevent any inadvertent choice being made when they were picked up. They were there examined, squared, measured, and calipered, and then tested on bed or edge, under steel, wood, lead, or leather, as the routine prescribed. When placed in the press each specimen was carefully centered to the axial line of pressure, and the power applied neither fast nor slow, but steadily. The records were not attempted to be made exact within 500 pounds - equal to 125 pounds per square inch on 2-inch beds and over. On smaller Specimens than 1-inch cubes 100 pounds was made the limit of error.

The weight of the movable parts of the press, with its attendant fric tion and the pump-stroke - abou't 800 pounds in all - is to be subtracted from the records in the general tables, or 200 pounds per square inch. The subject Of friction is discussed under the head of Testing the press and gauges.

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