Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 484
Fig. 1103. ^ egg-shaped form, but beyond the diameter of 24 inches or its equivalent sectionbrick is generally used. The vitrified pipe is laid either with (Fig. 1105) or without concrete base and side sup-ports, depending somewhat on thekind of earth through which it is
Mechanical drawing
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