Excerpt from The Formal Specification of the Elements of Stress in Cartesian, and in Cylindrical and Spherical Polar Coordinates
This paper is written to describe a few experiments undertaken tentatively in the hopes of obtaining some definite description of the circumstances and mode of rupture as the load is increased, and it is the author's intention to continue the investigation. The specimens experimented on were made of concrete in the proportion of 1 2 of cement, sand and stone, the aggregate being g-inch granite chippings, and were carefully prepared in wood moulds. After remaining in the moulds for seven days, they were removed and allowed to set under water for a month, and were finally tested four days after being removed from the water. The specimens were then sub jected in the ordinary way to compression in a horizontal testing machine with the results to be described. It would perhaps have been preferable to have used a vertical machine for the purpose, since when the load was not removed sufficiently quickly on causing rupture, the specimens were injured by the falling parts.
The author wishes to express his acknowledgments to Mr. J. H. Reynolds, the Principal of the Manchester Municipal School of Technology, to Mr. Popplewell, and to Mr. A. Herring-shaw for permission to use the laboratories and apparatus.
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