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The use of transparent sheets for overhead projection, called viewfoils or viewgraphs, was largely developed in the United States. Overhead projectors were introduced into U.S. military training during World War II as early as 1940 and were quickly being taken up by tertiary educators, [14] and within the decade they were being used in ...
An article written by Joshua Pearce in Science argued that overhead accounting practices hurt science by removing funds from research and discouraging the use of less-expensive open source hardware. [8] He went into detail on the accounting showing how millions were wasted each year on overhead cash grabs by university administrators in ZME ...
Overhead storage can refer to shelves, cabinets, hooks, lift tables [1] or track systems [2] mounted at height (either ceiling-hung or wall-hung), and can be a form of area-saving storage by moving storage up from the floor and utilizing the volume at height.
Overhead storage, for example overhead storage bins, racks, shelves, cabinets or track systems in aircraft, trains or buildings; Overhead cam, a mechanical device; Overhead join, in air traffic control; Overhead press, an upper-body weight training exercise in; Overhead crane or bridge crane, a type of crane sliding on two parallel rails
An overhead line or overhead wire is an electrical cable that is used to transmit electrical energy to electric locomotives, electric multiple units, trolleybuses or trams. The generic term used by the International Union of Railways for the technology is overhead line . [ 1 ]
The use of pantographs (or bow collectors) exclusively also eliminates the need for wire frogs (switches in the overhead wiring) to make sure the pole goes in the correct direction at junctions. The trolley pole with a shoe at its tip is problematic for longer modern streetcars that draw more electricity than older streetcars.
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This creates a so-called protocol overhead as the additional data does not contribute to the intrinsic meaning of the message. [5] [6] In telephony, number dialing and call set-up time are overheads. In two-way (but half-duplex) radios, the use of "over" and other signaling needed to avoid collisions is an overhead.