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2. Poly(methyl methacrylate) - Wikipedia

   en.wikipedia.org/wiki/Poly(methyl_methacrylate)

   The polymer separated from the glass as a clear plastic sheet, which Röhm gave the trademarked name Plexiglas in 1933. [5] Both Perspex and Plexiglas were commercialized in the late 1930s. In the United States, E.I. du Pont de Nemours & Company (now DuPont Company) subsequently introduced its own product under the trademark Lucite.

3. Aircraft canopy - Wikipedia

   en.wikipedia.org/wiki/Aircraft_canopy

   The bubble canopy of a Lockheed Martin F-22 Raptor Canopy of an F-22 Raptor. An aircraft canopy is the transparent enclosure over the cockpit of some types of aircraft.An aircraft canopy provides a controlled and sometimes pressurized environment for the aircraft's occupants, and allows for a greater field of view over a traditional flight deck.

4. Bubble canopy - Wikipedia

   en.wikipedia.org/wiki/Bubble_canopy

   The purpose of a bubble canopy is to give a pilot a much wider field-of-view than flush, framed "greenhouse" canopies used on early World War II aircraft, such as those seen on early models of the F4U, P-51, the Soviet Yak-1 and earlier, "razorback" P-47 fighters, all with dorsal "turtledecks" integral to their fuselage lines, which left a blind spot behind the pilot that enemy pilots could ...

5. Vehicle canopy - Wikipedia

   en.wikipedia.org/wiki/Vehicle_canopy

   Lifting canopy on a Sterling Nova. A vehicle canopy is a rarely used type of door for cars. It has no official name so it is also known as an articulated canopy, bubble canopy, [1] cockpit canopy, [2] canopy door, [3] or simply a canopy. [4] A canopy is a type of door which sits on top of a car and lifts up in some way, to provide access for ...

6. Crown closure - Wikipedia

   en.wikipedia.org/wiki/Crown_closure

   Crown closure and crown cover are two slightly different measures of the forest canopy and that determine the amount of light able to penetrate to the forest floor. Crown closure, also known as canopy closure, is an integrated measure of the canopy "over a segment of the sky hemisphere above one point on the ground". [1]

7. Canopy (architecture) - Wikipedia

   en.wikipedia.org/wiki/Canopy_(architecture)

   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.