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The word poppet shares etymology with "puppet": it is from the Middle English popet ("youth" or "doll"), from Middle French poupette, which is a diminutive of poupée.The use of the word poppet to describe a valve comes from the same word applied to marionettes, which, like the poppet valve, move bodily in response to remote motion transmitted linearly.
Illustration of track circuit invented by William Robinson in 1872 Track circuit transformer on the right, new axle counter on the left (Slovenia).. A track circuit is an electrical device used to prove the absence of a train on a block of rail tracks to control railway signals.
A B&M Dive Coaster that has four inversions, a height of 68 metres (225 ft) with a drop height of 75 metres (245 ft), a top speed of 130 kilometres per hour (81 mph), and a track length of 1,105 metres (3,625 ft), making it the tallest, fastest and longest dive coaster in the world. The ride also features the first vertical loop for a dive coaster.
The sport-oriented R69S, R69US, and R69 succeeded the plunger-framed 1951 to 1955 R68, which had an engine very similar to that in the later R69. The R69US models, with telescopic forks, which were used later on the BMW R-/5 series motorcycles, were introduced in the United States for the 1968 model year and then continued for 1969. Front and ...
Indirect injection squirts fuel into the inlet manifold (same as a carburettor). The injector is cheaper to make and easier to install but the efficiency of the engine is a bit less (fuel doesn't stay fully vapourised in the air stream). Stepho talk 00:42, 28 June 2014 (UTC)
Boston's Big Dig presented geotechnical challenges in an urban environment. Precast concrete retaining wall A typical cross-section of a slope used in two-dimensional analyzes.
Robert Dyas (/ ˈ d aɪ. ə s /) is a UK hardware retailer founded in London in 1872. It sells a range of housewares, small electrical appliances, gardening products, kitchenwares, DIY, and consumer electronics throughout 93 shops, mainly in Greater London and South East England, as well as online.