Carpentry made easy, or, The science and art of framing, on a new and improved system : with specific instructions for building balloon frames, barn frames, mill frames, warehouses, church spires, etc., comprising also a system of bridge building, with bills, estimates of cost, and valuable tables ... (1857)
Bell, William E · Philadelphia : Howard Challen · leaf 186
meansof which the whole structure can be kept tight, and the relative strainupon the arch beam and the chords can, to some extent, be regulatedand proportioned. Each pair of posts is bolted together with fourbolts—one above, and one below each chord. Bridges of this style are in extensive use on… … i r—tr^. n11 riiiTTr
Carpentry · Bridges
Internet Archive · UMass Dartmouth, Claire T. Carney Library · Public Domain Mark 1.0. Free to use for anything.
