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Various window blind styles. A window blind is a type of window covering. [1] There are many different kinds of window blinds which use a variety of control systems. A typical window blind is made up of several long horizontal or vertical slats of various types of hard material, including wood, plastic or metal which are held together by cords that run through the blind slats.
The color, as well as aperture size, known as Openness Factor, or OF, are two variables of fabric shades that can change view clarity perception. Darker fabric shades with larger openness factors generally achieve higher view clarity. [5] The impact of window coverings on view quality is of interest for designers, manufacturers, and researchers.
Diocletian windows, also called thermal windows, are large semicircular windows characteristic of the enormous public baths of Ancient Rome. They have been revived on a limited basis by some classical revivalist architects in more modern times.
In general, two or three windows united in a group, as was later the rule in Roman architecture, were even then of frequent occurrence in the early Christian architecture of Asia Minor. The form of the window is nearly everywhere the same: a rectangle that usually has a rounded top, but seldom a straight lintel.
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Analysis of Roman glass has shown that soda (sodium carbonate) was used exclusively in glass production. [10] During this period, the primary source of soda was natron, a naturally occurring salt found in dry lake beds. The main source of natron during the Roman period was Wadi El Natrun, Egypt, although there may have been a source in Italy.