. An illustrated dictionary of words used in art and archaeology. Explaining terms frequently used in works on architecture, arms, bronzes, Christian art, colour, costume, decoration, devices, emblems, heraldry, lace, personal ornaments, pottery, painting, sculpture, &c., with their derivations . e extant on this science isEuclids Optica et Catoptrica. (Cf. Dr. Sj/iithsOptics, &c.) Optigraph. A telescope for copying land-scapes. (See Claude Glass.) Optostratum, R. {h-Krtis, brick, and arpunuv,strewn). A brick pavement, often arranged ina herring-boned pattern, as in the Opus Spica-TUM. (Fig. 5
. An illustrated dictionary of words used in art and archaeology. Explaining terms frequently used in works on architecture, arms, bronzes, Christian art, colour, costume, decoration, devices, emblems, heraldry, lace, personal ornaments, pottery, painting, sculpture, &c., with their derivations . e extant on this science isEuclids Optica et Catoptrica. (Cf. Dr. Sj/iithsOptics, &c.) Optigraph. A telescope for copying land-scapes. (See Claude Glass.) Optostratum, R. {h-Krtis, brick, and arpunuv,strewn). A brick pavement, often arranged ina herring-boned pattern, as in the Opus Spica-TUM. (Fig. 509.) Opus Albarium. (See Stucco.) Opus Alexandrinum. A mosaic flooring wmmwm mwmmmm Kig. 503. Alexandriinim opus. much used by the Romans, consisting of geo-metric figures, and generally of only two kindsof tessera, red and black on a white ground. (SeeMusivuM Opus.) Opus Araneum (spider-work). A kind ofembroidery, 13th century; modern guipuredart. Opus Consutum. Applique work in embroi-dery. (See AppLiQUfi.) Opus Filatorium. A kind of embroidery,14th century ; modern filet brode. Opus Grsecum, R. Inlaid pavement. (SeeMrjsivuM Opus.) Opus Incertum, R. A Roman method ofbuilding ; the construction of walls of very smallrough stones, not laid in courses, but held toge-ther by the Fig. 504. Pseudisodomum opus, with a course of opusinsertum. Opus Insertum, R. A Roman method ofbuilding, of courses of flat tiles, the most durableof all. Such courses were also introduced inthe other kinds of stone and brick walls, inwhich they served as bond-courses, and alsokept the damp from rising from the ground.
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