. The life of the Greeks and Romans. 332 TOWN-WALLS OF Fig. 349. were heaped up, and the erection thus gained was enclosed onboth sides with strong brick walls. In these walls, as well as in those made of massive stone,different modes of structure werein use, by means of which theappearance of the walls was con-siderably modified. Either thewhole wall consisted of a mixtureof mortar and unbaked bricks(called opus incertum by Yitru-vius), or the outer surface ofthe wall was faced with regularbricks of equal size. In thiscase, also, two modes of construc-tion became possible, the stone
. The life of the Greeks and Romans. 332 TOWN-WALLS OF Fig. 349. were heaped up, and the erection thus gained was enclosed onboth sides with strong brick walls. In these walls, as well as in those made of massive stone,different modes of structure werein use, by means of which theappearance of the walls was con-siderably modified. Either thewhole wall consisted of a mixtureof mortar and unbaked bricks(called opus incertum by Yitru-vius), or the outer surface ofthe wall was faced with regularbricks of equal size. In thiscase, also, two modes of construc-tion became possible, the stones being either triangular in shapeand arranged in horizontal layers (Fig. 349), or being cut into Quadrangular prismswhich were pressed intothe soft mortar, so thatthe joints crossed eachother in a net-like man-ner (ojms reticulation).Fig. 350 illustrates thelatter mode of structure,which also appears, forinstance, in the walls ofa conduit of the Alsie-tine aqueduct. The inside of these walls consists of irregularbricks joined together by mortar (opus incertum
Size: 1740px × 1436px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondonchapmanandha
