McMaster, John Bach, 1852-1932, Making of America Project · New York, D. Van Nostrand · leaf 42
eces and tie beam between them,the joints, especially in the larger andheavier arches, must be secured by piecesof iron placed across them and bolted tothe backpieces and struts, to prevent thejoints opening in consequence of thebulging at the crown as course aftercourse of stone is laid on the… … 38 fied and a frame produced (Figure 2),which shall meet all the requirements ofstrength, lightness and economy. Therib in this case again consists of a horizontal tie beam spanning the arch a littleabove the springing line, generally atthe first voussoir that presses on thebackpieces, and struts…
Bridges · Tunneling
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