sufficient lighting
71Low-energy house — A thermogram compares the heat radiation of the windows and walls of two buildings: sustainable low energy passive house (right) and conventional leaking house (left) See also: Passive house A low energy house is any type of house that from… …
72Flash (photography) — The furious wing action of a Hummingbird Hawk moth is frozen by flash. The flash has given the foreground more illumination than the background. See Inverse square law A flash is a device used in photography producing a flash of artificial light… …
73Technological and industrial history of the United States — The technological and industrial history of the United States describes the United States emergence as one of the largest nations in the world as well as the most technologically powerful nation in the world. The availability of land and labor,… …
74Light switch — A light switch is a switch, most commonly used to operate electric lights, permanently connected equipment, or electrical outlets.In modern homes most lights are operated using switches set in walls, usually 6 10 inches (15 25 cm) away from a… …
75Passive house — The term passive house ( Passivhaus in German) refers to the rigorous, voluntary, Passivhaus standard for energy use in buildings. It results in ultra low energy buildings that require little energy for space heating or cooling. [… …
76BS 546 — is an old British Standard for domestic AC power plugs and sockets. These are also known as type D (for the 5 A 3 pin) and type M (for the 15 A 3 pin) in US documentation. When viewed in photographs with no indication of scale the different… …
77Artificial sunlight — is the use of a light source to simulate sunlight where the unique benefits of sunlight are needed, but where sufficient natural sunlight is not available or is not feasible. The concept has various applications including greenhouse lighting,… …
78History of manufactured gas — The history of manufactured gas, important for lighting, heating, and cooking purposes throughout most of the nineteenth century and the first half of the twentieth century, began with the development of analytical and pneumatic chemistry in the… …
79lighthouse — /luyt hows /, n., pl. lighthouses / how ziz/. 1. a tower or other structure displaying or flashing a very bright light for the guidance of ships in avoiding dangerous areas, in following certain routes, etc. 2. either of two cylindrical metal… …
80Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… …
