Henry Cavendish

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Noun1.Henry Cavendish - British chemist and physicist who established that water is a compound of hydrogen and oxygen and who calculated the density of the earth (1731-1810)
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Near the end of the 19th century, the ordinary beam balance -- widely used in analytical chemistry -- rivaled the Cavendish balance as the chief instrument for determining G.
Workers at the Physikalisch-Technische Bundesanstalt in Braunschweig, Germany, have built a Cavendish balance that uses transparent quartz masses, the internal structure of which can be optically mapped for density variations.
In particular, a space mission could isolate the experiment from the vibrational and gravitational accelerations that so easily couple into the Cavendish balance.