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• List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …   Wikipedia

• photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

• Nikon F-mount — The Nikon F of 1959 embodies the original F mount. Type Bayonet External diameter 44 mm Tabs 3 Flange 46.5 …   Wikipedia

• keyboard instrument — ▪ music Introduction       any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… …   Universalium

• View camera — The view camera is a type of camera first developed in the era of the DaguerreotypeStroebel, L. D. (1986). View Camera Technique , 5th ed., p. 212. Boston: Focal Press. ISBN 0 240 51711 3] and still in use today, though with many refinements. It… …   Wikipedia

• Mechanical fan — Household electric box fan with a propeller style blade A mechanical fan is a machine used to create flow within a fluid, typically a gas such as air. A fan consists of a rotating arrangement of vanes or blades which act on the air. Usually, it… …   Wikipedia

• Camera — For other uses, see Camera (disambiguation). Various cameras A camera is a device that records and stores images. These images may be still photographs or moving images such as videos or movies. The term camera comes from the camera obscura… …   Wikipedia

• Single-lens reflex camera — The single lens reflex (SLR) camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non SLR cameras where the view through the… …   Wikipedia

• History 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… …   Wikipedia

• Expression pedal — An expression pedal is an important control found on many organs and synthesizers that allows the volume of the sound to be manipulated. Because the source of power with a pipe organ and electronic organs is not generated by the organist, the… …   Wikipedia

• Mamiya RZ67 — RZ67 Pro I ready for shooting The Mamiya RZ67 line of medium format single lens reflex cameras manufactured by Mamiya includes three successive models, the RZ67 Professional (first model released in 1982), RZ67 Professional II (released in 1995)… …   Wikipedia