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It is typically composed of canvas woven of acrylic, cotton or polyester yarn, or vinyl laminated to polyester fabric that is stretched tightly over a light structure of aluminium, iron or steel, possibly wood or transparent material (used to cover solar thermal panels in the summer, but that must allow as much light as possible in the winter).
Canopy over a doorway in Fergana, Uzbekistan Canopied entrance to the New York City Subway at the 14th Street–Union Square station. A canopy is a type of overhead roof or else a structure over which a fabric or metal covering is attached, able to provide shade or shelter from weather conditions such as sun, hail, snow and rain.
Splined canvas can be restretched by adjusting the spline. Stapled canvases stay stretched tighter over a longer period of time, but are more difficult to re-stretch when the need arises. Canvas boards are made of canvas stretched over and glued to a cardboard backing, and sealed on the backside. The canvas is typically linen primed for a ...
The oldest known use of fabrics as a painting support dates back to the Dynasty XII in Egypt (2000 BC).The continuous use can be traced in both Europe and Asia. In Medieval Europe fabrics was overtaken by the wood panels for church use; Renaissance, with its wider spread of paintings, saw wide use of canvas, occasionally glued to the wood, a practice that originated in the Ancient Egypt, but ...
Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door. A typical panel would be cut to allow 1/4" (5 mm) between itself and the bottom of the groove in the frame.
Inbuilts do not fit every vehicle, as the panel must slide and store completely within the vehicle roof. Historically, inbuilts were a metal sunroof panel painted to match the vehicle roof, but now most are glass-panel systems with sliding sunshades (typically referred to as moonroofs). One of the first examples was the 1960 Ford Thunderbird.