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Curtain rods can be made of many materials including wood, metal and plastic. They are available in a variety of styles and designs. While many curtain rods are simple straight poles, there are also curved and hinged options. These designs facilitate installation in bay windows, around curved walls, and in corners.
A Roman poet Lucretius, in 50 BC, said "Linen-awning, stretched, over mighty theatres, gives forth at times, a cracking roar, when much 'tis beaten about, betwixt the poles and cross-beams". Among the most significant awnings in the ancient world was the velarium , the massive complex of retractable shade structures that could be deployed above ...
While these curtain wall systems are more energy-efficient than older, single-glazed versions, they are still significantly less efficient than opaque (solid) wall construction. [13] For example, nearly all curtain wall systems, thermally-broken or otherwise, have a U-value of 0.2 or higher, which is equivalent to an R-value of 5 or lower. [14]
A type of support. An arc-boutant, or flying buttress, serves to sustain a vault, and is self-sustained by some strong wall or massive work. A pillar boutant is a large chain or jamb of stone, made to support a wall, terrace, or vault. The word is French, and comes from the verb bouter, "to butt" or "abut". [4] Bracket (see also corbel)
Larger curtain walls were provided with mural passages or galleries built into the thickness of the walls and provided with arrowslits. If an enemy reached the foot of the wall, they became difficult to see or shoot at directly, so some walls were fitted with a projecting wooden platform called a hoarding or brattice.
The defensive system of Verona is a military, logistical and infrastructural complex consisting of city walls, bastions, forts, entrenched camps, warehouses and barracks, built between 1814 and 1866 during Habsburg rule, which made the Venetian city, the pivot of the so-called "Quadrilatero," one of the strong points of the Empire's strategic system.