Concrete bridges and culverts, for both railroads and highways (1909)
Tyrrell, H. G. (Henry Grattan), b. 1867 · Chicago The M.C. Clarke publishing co. [etc.] · leaf 39
rcular, segmental,elliptical, or multi-centered. These four types canbe reduced to two. circular and elliptical, for the seg-mental arch is merely a segment of a circle, and themulti-centered arch is merely an approximate ellipse.The two general forms are, therefore, the circu-lar and the… … Fig. 1 with radii AD and CD, respectively. From i)ointswhere a common radius intersects the two circulararcs, draw vertical and horizontal ordinates. The in-tersection of these ordinates gives points on the ellipse. Multi-Centered Arch—Three Centers. These curves are sometimes called…
Bridges, Concrete · Culverts
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-265-170.webp)
