specified lengths
121Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …
122Crankset — A Shimano Deore right crankset, showing crank arm, spider, three chainrings and chainring guard …
123Constructible polygon — Construction of a regular pentagon In mathematics, a constructible polygon is a regular polygon that can be constructed with compass and straightedge. For example, a regular pentagon is constructible with compass and straightedge while a regular… …
124Metes and bounds — is a system or method of describing land, real property (in contrast to personal property) or real estate. The system has been used in England for many centuries, and is still used there in the definition of general boundaries. By custom, it was… …
125Niagara Falls Suspension Bridge — Niagara Falls Suspension Bridge …
126Special right triangles — Two types of special right triangles appear commonly in geometry, the angle based and the side based (or Pythagorean) triangles. The former are characterised by integer ratios between the triangle angles, and the latter by integer ratios between… …
127Nikon F-mount — The Nikon F of 1959 embodies the original F mount. Type Bayonet External diameter 44 mm Tabs 3 Flange 46.5 …
128Microform — For other uses, see Microform (disambiguation). Digital scanning of microfilm (see Digital conversion below). Microforms are any forms, either films or paper, containing microreproductions[1] of documents for transmission, storage, reading, and… …
