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2. Skylight - Wikipedia

   en.wikipedia.org/wiki/Skylight

   Solar tubes, sun tunnels, or tubular skylights consist of a roof-mounted fixed unit skylight element, condensing sunlight, distributed by a light conveying optic conduit to a light diffusing element. [3] Being small in diameter, they can be used for daylighting smaller spaces such as hallways, and bounce light in darker corners of spaces. TDDs ...

3. Spherical cap - Wikipedia

   en.wikipedia.org/wiki/Spherical_cap

   In geometry, a spherical cap or spherical dome is a portion of a sphere or of a ball cut off by a plane. It is also a spherical segment of one base, i.e., bounded by a single plane. If the plane passes through the center of the sphere (forming a great circle ), so that the height of the cap is equal to the radius of the sphere, the spherical ...

4. Cricket (roofing) - Wikipedia

   en.wikipedia.org/wiki/Cricket_(roofing)

   A cricket or saddle is a ridge structure designed to divert water on a roof around the high side of a large penetration, typically a skylight, equipment curb, or chimney. [1] In some cases, a cricket can be used to transition from one roof area to another.

5. Replacement value - Wikipedia

   en.wikipedia.org/wiki/Replacement_value

   The term replacement cost or replacement value refers to the amount that an entity would have to pay to replace an asset at the present time, according to its current worth. [1] In the insurance industry, "replacement cost" or "replacement cost value" is one of several methods of determining the value of an insured item. Replacement cost is the ...

6. Dome - Wikipedia

   en.wikipedia.org/wiki/Dome

   Bulbous domes bulge out beyond their base diameters, offering a profile greater than a hemisphere. [3] An onion dome is a greater than hemispherical dome with a pointed top in an ogee profile. [3] They are found in the Near East, Middle East, Persia, and India and may not have had a single point of origin.

7. Buckminster Fuller - Wikipedia

   en.wikipedia.org/wiki/Buckminster_Fuller

   [44] [45] In his book Critical Path (1981) he cited the opinion of François de Chadenèdes [46] (1920–1999) that petroleum, from the standpoint of its replacement cost in our current energy "budget" (essentially, the net incoming solar flux), had cost nature "over a million dollars" per U.S. gallon ($300,000 per litre) to produce.