Equilateral Arch Small 320×252 Medium 640×504 Large 1024×807 Download Tiff Original 2400×1891 | (305.9 KB) Description "Equilateral pointed arches, described from two centers, the radius being the whole width of the arch." — The Encyclopedia Britannica, 1910 Keywords arch, equilateral, keystone, Springers, Voussoir, wedge Galleries Arches Source: The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)II:343
