. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WOOD PIPE FOR CONVEYING IRRIGATION WATER, 11 come this tendency it is now a common practice to specify additional bands at the joints, and to bring all joints within a space of 2 to 4 feet. COUPLING SHOES. The designing of shoes is now left principally to the manufactur- ers, and selection may be made from a number of patterns. Light weight in most instances, where not subject to excessive corrosion, is the chief consideration after strength equal to that of the bands is assured. Cast-iron shoes were used principally d
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WOOD PIPE FOR CONVEYING IRRIGATION WATER, 11 come this tendency it is now a common practice to specify additional bands at the joints, and to bring all joints within a space of 2 to 4 feet. COUPLING SHOES. The designing of shoes is now left principally to the manufactur- ers, and selection may be made from a number of patterns. Light weight in most instances, where not subject to excessive corrosion, is the chief consideration after strength equal to that of the bands is assured. Cast-iron shoes were used principally during the earlier years of continuous stave pipe building. They were heavy and easily broken, and on this account common cast iron has given place to malleable cast iron and steel. Malleable iron for this purpose should be of the most tenacious character, capable of standing con- siderable hammering without fracture. The tensile strength should be not less than 40,000 pounds per square inch of section. Steel for shoes should in quality be equal in all respects to that required for 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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