Raymond, William Galt, 1859-1926, Raymond, William Galt, 1859-1926. cre · New York, J. Wiley & sons, inc · leaf 83
VERTS Blind Drains. — A blind drain consists of cobble or large brokenstones, carefully laid so that water in small quantities can find itsway between them and thus under the bank. A better construc-tion for the same purpose is a line of vitrified earthen pipe orcast-iron pipe, from 4 inches to i… … Fig. 21 is very expensive, wood cheap, and the item of first cost an im-portant one. Wood culverts consist of rectangular boxes as longas the width of the bottom of the embankment, and are usuallybuilt of heavy timbers, as shown in the plan. Fig. 21. A portionof the cover timbers are notched dowTi…
Railroad engineering
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