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Power shovels normally consist of a revolving deck with a power plant, drive and control mechanisms, usually a counterweight, and a front attachment, such as a crane ("boom") which supports a handle ("dipper" or "dipper stick") with a digger ("bucket") at the end. The term "dipper" is also sometimes used to refer to the handle and digger combined.
When used on a tram or trolley car (i.e. a railway vehicle), a single trolley pole usually collects current from the overhead wire, and the steel rails on the tracks act as the electrical return. To reduce electrolytic corrosion of underground pipes and metallic structures, most tram lines are operated with the wire positive with respect to the ...
Four-step brake handle on a UK Class 317 Electric Multiple Unit For the system adopted across British Railways from 1950 onwards, see Electro-pneumatic brake system on British railway trains . The higher performing EP brake uses a "main reservoir pipe" feeding air to all the brake reservoirs on the train, with the brake valves controlled ...
The earliest known examples of "push-pull" engined-layout aircraft was the Short Tandem Twin.. An early pre-World War I example of a "push-pull" aircraft was the Caproni Ca.1 of 1914 which had two wing-mounted tractor propellers and one centre-mounted pusher propeller.
Double deck trains are claimed to be more energy efficient, [2] and may have a lower operating cost per passenger. [3] A bi-level car may carry up to about twice as many as a normal car, if structure and loading gauges permit, without requiring double the weight to pull or material to build. However, a bi-level train may take longer to exchange ...
The grid deck, gridiron deck, or grid, is a permeable working surface present at the top of many fly lofts that is used to support and provide access to many of a rigging system's components. Though originally constructed of wood, down-facing three-inch steel channels with three-inch gaps became the prevalent grid decking in the 20th century.
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