. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WOOD PIPE FOR CONVEYING IRRIGATION WATER. 17 metal, thus leaving it subject to decay. It is considered better prac- tice to insert the wood pipe into the metal pipe and calk with lead and oakum. To do this usually requires a special coupling either of cast iron or steel. An example of a cast fitting illustrating this method of joining wood pipe and cast-iron pipe is shown by figure 5, and another of steel for uniting wood pipe and steel pipe by figure 6. An important fea- ture in both of these designs is the thim- ble
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WOOD PIPE FOR CONVEYING IRRIGATION WATER. 17 metal, thus leaving it subject to decay. It is considered better prac- tice to insert the wood pipe into the metal pipe and calk with lead and oakum. To do this usually requires a special coupling either of cast iron or steel. An example of a cast fitting illustrating this method of joining wood pipe and cast-iron pipe is shown by figure 5, and another of steel for uniting wood pipe and steel pipe by figure 6. An important fea- ture in both of these designs is the thim- ble or flange which fits inside the wood staves to prevent them from being forced in by the calking. If continuous stave pipes are built above ground it is usually best to sup- port them in. " cra- dles " or " ; In the design and spacing of supports of this kind the ideas and judgment of en- gineers differ and as yet there is no stand- ard practice. Cradles of the general type shown by figure 7, A, were used on several large pipe lines of the Kings Hill irriga- tion system in Idaho, and they appear to be well designed. On some pipe lines the 2 by 12 inch mudsills are continuous; on others, blocks 18 inches long are used. The use of short blocks in this way is more economical of material, and requires less grading. The cradles of the type shown by Plate IV, figure 1, were spaced 6 feet center to center under a 54-inch pipe, and to support a pipe 100 inches in diameter cradles of the same type of 8 by 8 inch material 61133°—Bull. 155—14 3. gad Btft Circle 43 K-. 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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