Plate XX. Roman “D” or Tribune Plans

Plate XX. — In No. I a simple “D” plan of small size is shown with columnar screen, and two methods of treating the elevation are given; in No. II the semi-dome is finished against a pediment which is a conspicuous feature of the design, and in No. III the curve of the semi-dome is expressed by a crowning segmental cornice: both are in accordance with Roman precedents. No. IV is an exedra of larger dimensions in which the curve of the dome is revealed to form a frontispiece, and further renderings of the same motive are given in Nos. V to VII. All these examples can be adapted for both internal and external treatments: they can be used for shelters in public parks and features in town furnishing; as open loggias for the display of sculpture and as incidents in the design of exhibition buildings.