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A centrifuge is a device that uses centrifugal force to subject a specimen to a specified constant force - for example, to separate various components of a fluid. This is achieved by spinning the fluid at high speed within a container, thereby separating fluids of different densities (e.g. cream from milk) or liquids from solids. It works by ...
English military engineer Benjamin Robins (1707–1751) invented a whirling arm centrifuge to determine drag. 1766 British chemist Henry Cavendish determines the specific weight of hydrogen gas.
His whirling arm was 5 feet (1.5 m) long and attained speeds between 10 and 20 feet per second (3 to 6 m/s). Otto Lilienthal used a rotating arm to make measurements on wing airfoils with varying angles of attack, establishing their lift-to-drag ratio polar diagrams, but was lacking the notions of induced drag and Reynolds numbers. [5]
To measure the drag on objects at different speeds and angles of attack, he later built a "whirling-arm apparatus", a development of earlier work in ballistics and air resistance. He also experimented with rotating wing sections of various forms in the stairwells at Brompton Hall.
Benjamin Robins was born in Bath. [1] His parents were Quakers in poor circumstances, and as a result, he received very little formal education. [1] Having come to London on the advice of Dr. Henry Pemberton (1694–1771), who had recognised Robins's talents, [1] for a time he maintained himself by teaching mathematics, but soon devoted himself to engineering and the study of fortification.
Ford CEO Jim Farley has a message for the Trump administration: Our profits will be run over if you hit the world with tariff hikes."There's no question that tariffs at [the] 25% level from Canada ...
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