An Integraph is an instrument used in mathematics for plotting the integral of a graphically defined function. It was invented independently about 1880 by the British physicist Sir Charles Vernon Boys and by Bruno Abakanowicz, a Polish-Lithuanian mathematician from the Russian Empire. An integraph consists of a rectangular carriage which moves lef...
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http://en.wikipedia.org/wiki/Integraph
mathematical instrument for plotting the integral of a graphically defined function. Two such instruments were invented independently about 1880 by ...
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http://www.britannica.com/eb/a-z/i/27
integrator (def. 2).
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https://www.infoplease.com/dictionary/integraph
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