. Bulletin. Agriculture; Agriculture -- Arizona. Tests 119 be strengthened somewhat by anchored bearings, but at the center of the pipe a shearing stress is developed which might induce failure under some extreme conditions. This shearing stress will be a mathematical average in value between the unit tension and the unit compression, both being considered as positive and will be a maximum on an angle of 45 degrees. In all the tests at the City- Water Works no pipe was observed to fail while the jackscrew was being turned in the effort to reduce the leakage past the Fi^ Tl'SL specime
. Bulletin. Agriculture; Agriculture -- Arizona. Tests 119 be strengthened somewhat by anchored bearings, but at the center of the pipe a shearing stress is developed which might induce failure under some extreme conditions. This shearing stress will be a mathematical average in value between the unit tension and the unit compression, both being considered as positive and will be a maximum on an angle of 45 degrees. In all the tests at the City- Water Works no pipe was observed to fail while the jackscrew was being turned in the effort to reduce the leakage past the Fi^ Tl'SL specimens biukL-u in intni nul-in^ lilt- ; machine. Nor were there any breaks which showed a failure in shear at the midheight of the specimen. On a similar testing frame recently three men attempted to break an 8-inch pipe by applying the utmost pressure, but were unable to injure the pipe. The record of tests, excluding some that were rejected, is given in Tables VIII and IX. The first of these two tables gives the pre- liminary measurements and age of the test pieces, and the second table gives the results of the tests. Examination of Table VIII proves that the wall thickness of machine-made pipe is very uniform, the variation being less than one-eighth inch. The thickness of hand-made pipe is uniform at the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Arizona. Agricultural Experiment Station. Tucson : Agricultural Experiment Station, University of Arizona
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