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Whistles that generate sound through fluctuations of momentum or stress and strain of a force exerted on the surrounding medium are called dipole-like sources. The figure on the right is an example of a small rigid sphere that is moving back and forth in a given direction. This results in a non-uniform sound field.
Bicycle suspension is the system, or systems, used to suspend the rider and bicycle in order to insulate them from the roughness of the terrain. Bicycle suspension is used primarily on mountain bikes, but is also common on hybrid bicycles . Bicycle suspension can be implemented in a variety of ways, and any combination thereof: Front suspension ...
Steam whistles were often used in factories and similar places to signal the start or end of a work shift, etc. Steam railway locomotives, traction engines, and steam ships have traditionally been fitted with a steam whistle for warning and communication purposes. Large diameter, low-pitched steam whistles were used on light houses, likely ...
No. 4472 Flying Scotsman is a LNER Class A3 4-6-2 "Pacific" steam locomotive built in 1923 for the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. It was employed on long-distance express passenger trains on the East Coast Main Line by LNER and its successors, British Railways ' Eastern and North Eastern ...
Warraich’s study, conducted in partnership with the web-based pharmacy GoodRx, found that of the 3,143 counties in the U.S., 46.3% don't have a cardiologist. Most of those, 86.2%, are rural ...
A slide whistle (variously known as a swanee or swannee whistle, lotus flute, [1] piston flute, or jazz flute) is a wind instrument consisting of a fipple like a recorder 's and a tube with a piston in it. Thus it has an air reed like some woodwinds, but varies the pitch with a slide. The construction is rather like a bicycle pump.
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