Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 82
Fig. 9SA. TYPES OF STEEL TRUSSES. j$ In all of these trusses the arched ribs are supported at the bot-tom on a turned steel pin, and with the exception of the Frankforttruss all abut against a pin at the top, thus giving the name—Three-Hinged Arch. … Fig. 99. Usually the trusses are surmounted by a lantern, as shown inFigs. 101 and 102, which are bolted or riveted together at thecentre. With the shape of ribs generally used there is always a slightoutward thrust at the bottom, which must be resisted either by the
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