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Darts consist of a paper cone 20 cm (8 in) long, weighing 0.8 g (3 ⁄ 100 oz). Cherokee – made of river cane , [ 7 ] 2 to 3 m (6 to 9 ft). Dart is 15 to 56 cm (6 to 22 in) long and made of locustwood or other available hardwoods such as oak, ash, maple, walnut, etc., fletched with thistle down or rabbit fur, that provides an air seal.
All but one of the stations along the DART network are open-air structures featuring passenger canopies for protection from adverse weather conditions. [1] Stations with side platforms typically have dimensions of 300 feet (91 m) long by 17 feet (5.2 m) wide, while stations with an island platform typically have dimensions of 300 feet (91 m ...
The kestrosphendone, or kestros, was a sling-launched dart, invented in 168 BC for the Third Macedonian War, probably similar to hand-thrown darts of the period. Casting one (according to surviving records) requires a specially designed sling with two unequal loops, though it is not clear whether this is a stave-sling or more closely resembles ...
Concept art of hyperloop inner workings. Hyperloop is a proposed high-speed transportation system for both passengers and freight. [1] The concept behind the Hyperloop originated in the late 17th century with the invention of the world's first artificial vacuum, which led to designs for underground rapid transit systems powered by pneumatics in the decades that followed.
It is owned and operated by Dallas Area Rapid Transit (DART). The system opened June 14, 1996 and serves 65 stations and four lines, covering 93 miles (149.7 km): the Blue Line, the Red Line, the Green Line, and the Orange Line. In 2023, the system had a ridership of 21,380,900, or about 63,200 per weekday as of the third quarter of 2024.
A variety of empty glass drying tubes. When used, they are packed with a desiccant, usually calcium chloride. A drying tube or guard tube is a tube-like piece of apparatus used to house a disposable solid desiccant, wherein at one end the tube-like structure terminates in a ground glass joint for use in connecting the drying tube to a reaction vessel, for the purpose of keeping the vessel free ...
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The vortex tube, also known as the Ranque-Hilsch vortex tube, is a mechanical device that separates a compressed gas into hot and cold streams. The gas emerging from the hot end can reach temperatures of 200 °C (390 °F), and the gas emerging from the cold end can reach −50 °C (−60 °F). [ 1 ]