with the abutments, as shown by the lines a b, c d. Equalstrength with the same amount of material will be obtainedby building a number of thin longitudinal and cross walls, asshown in fig. 27, by which means, the earth being kept from Fig. 27. IfeEsES … the back of the walls, there is no tendency to failure of thiskind. 81 Vaulting.—The ordinary forms of vaults may beclassed under three heads, viz., cylindrical, coved, and groined A cylindrical vault is simply a semicircular arch, the endsof which are closed by upright walls, as shown in fig. 28.…
Architecture · Building
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.