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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.
Awnings were first used by the ancient Egyptian and Syrian civilizations. They are described as "woven mats" that shaded market stalls and homes. 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".
Roman townhouses rarely had windows, as they often had very little exterior wall. Where present, windows were placed above eye-level, and they were small [4] and contained clathri, window lattices. [4] The compluvium provided most or all of the light to the atrium, its alae, and the adjacent cubiculums.
Roman rectangular scutums of later eras were smaller than Republican oval scutums and often varied in length from approximately 37 to 42 in (94 to 107 cm) tall (approximately 3 to 3.5 Roman feet, covering the shoulder to top of knee), and 24 to 33 in (61 to 84 cm) wide (approximately 2 to 2.7 Roman feet).
Ancient Roman units of length Roman unit English name Equal to Metric equivalent Imperial equivalent Notes digitus: finger: 1 ⁄ 16 pes 18.5 mm 0.728 in 0.0607 ft uncia pollex inch thumb 1 ⁄ 12 pes 24.6 mm 0.971 in 0.0809 ft palmus (minor) palm 1 ⁄ 4 pes 74 mm 0.243 ft palmus maior: palm length (lit."greater palm") 3 ⁄ 4 pes 222 mm
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