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 40
e semi-minor axis. Join BE and bisectthe line BE at F. Through F draw a perpendicu-lar to BE. intersecting the line CD at 0. The twojioints 0 and E will be centers of two circular arcswhich will form an approximate ellipse. By firstselecting the position of the point E so the circulararc described… … 22 CONCRETE BRIDGES AND CULVERTS. Five-Centered Arch. A method for drawing a five-centered arch is asfollows:— In order to check on the work, it is advisable tofirst draw tlie form of the true ellipse by the method given above. InFigure 3 the twocurves so closelycorrespond thatonly one can beshown.…
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)
