double-curved plate
81island arc — a curved chain of islands, as the Aleutians or Antilles, usually convex toward the ocean and enclosing a deep sea basin. [1905 10] * * * Long, curved chain of oceanic islands associated with intense volcanic and seismic activity and mountain… …
82Mirror — looking glass redirects here. For other uses, see Looking Glass (disambiguation). This article is about wave reflectors (mainly, specular reflection of visible light). For other uses, see Mirror (disambiguation). A mirror, reflecting a vase A… …
83optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
84Clarinet — This article is about the musical instrument. For ClariNet, see ClariNet. Clarinet B♭ Clarinet (Boehm system) Woodwind instrument Classification Wind Woodwind …
85History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
86Rail profile — Rail from 1896 Cross sections of flat bottomed which can rest directly …
87List of birds of Ecuador — This is a list of the bird species recorded in Ecuador. The avifauna of Ecuador includes a total of 1663 species, of which 16 are endemic, 2 have been introduced by humans, and 19 are rare or accidental. 77 species are globally threatened.This… …
88turbine — /terr bin, buyn/, n. any of various machines having a rotor, usually with vanes or blades, driven by the pressure, momentum, or reactive thrust of a moving fluid, as steam, water, hot gases, or air, either occurring in the form of free jets or as …
89List of Hollows in Bleach — The Bleach anime and manga feature an extensive cast of beings known as Hollows (虚（ホロウ）, Horō?), the central antagonists of the series. These are malevolent, deceased souls of formerly ordinary humans[1] in the Bleach universe. Much of the series …
90One pound (British coin) — This article is about the circulating one pound coin issued since 1983. For earlier coins worth one pound, see Sovereign (British coin), Broad (British coin), Laurel (English coin), and Unite (English coin). One pound United Kingdom Value 1 pound …
