Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 71
ght sheet iron. These forms are usually builtin lengths of 16 feet, with onecenter at each end, and with threeto five (depending on the size ofthe sewer or conduit) intermedi-ate centers in the lengths of 15 feet. The segmental ribs are bol edtogether. The plank for these forms are made of 2 by… … Fig. 33. Center for 8-ft. Sewer. 57
Architecture · Building · Carpentry
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