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The interior of the house was cave-like, featuring cramped rooms and low ceilings, although it is not clear whether these accounts describe the same Xanadu House with a thirty-foot dome. The interiors used a cream color for the walls, and a pale green for the floor.
Francesco Borromini's dome of San Carlo alle Quattro Fontane (1638–41) has a novel oval plan that approximates an ellipse using four circular arcs based on the vertices of two large equilateral triangles; a complex geometrical coffer pattern of crosses, octagons, and lozenges is repeated eight times on the dome's inner surface.
The dome was made of flat iron sections and reinforced with ties that passed through the interior of the dome. Such dome reinforcement was one of the two established techniques, the other being the use of a combination of horizontal rings and vertical ribs. [12] The span may have been about 27 meters. [30]
Set in mud mortar, it was a "true dome with pendentives rounding off the angles of the square chamber." Other small domes can be inferred from the remaining ground plans, such as one in the courtyard of Ur-Nammu 's ziggurat, and in later shrines and temples of the 14th century BC. [ 22 ]
Cover of the 1916 catalog of Gordon-Van Tine kit house plans A modest bungalow-style kit house plan offered by Harris Homes in 1920 A Colonial Revival kit home offered by Sterling Homes in 1916 Cover of a 1922 catalog published by Gordon-Van Tine, showing building materials being unloaded from a boxcar Illustration of kit home materials loaded in a boxcar from a 1952 Aladdin catalogue
It applies local traditions to modern technology to construct dome-shaped buildings that it says are cheaper, more environmentally sustainable and more energy-efficient than regular concrete homes.
A dome can rest directly upon a rotunda wall, a drum, or a system of squinches or pendentives used to accommodate the transition in shape from a rectangular or square space to the round or polygonal base of the dome. The dome's apex may be closed or may be open in the form of an oculus, which may itself be covered with a roof lantern and cupola.
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