were scored with a comb-like instrumentor scratch, in order to make the mortar adhere to them. Theupper surface of the vault was covered with a thick layer ofcoarse mortar, into which had been pressed half-round roofing-tiles {imbrices) arranged longitudinally so as to lace together thesuccessive…
Architecture, Roman · Architecture · Romans
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![An illustration from M. Vitrvvii De architectvra libri decem : nuper maxima diligentia castigati atq[ue] excusi : additis Iulij Frontini De aqueductibus libris propter materiae affinitatem (1522)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviidearchi00vitr-71-22.webp)
