Definition of "integraph" []

• A device that determines the value of an integral by measuring the area under a curve (and drawing the curve of its integral) (noun)

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• "Boys 'integraph was invented during a sleepless night, and during the following days carried out as a working model, which gives highly satisfactory results."
• "The instrument now is an _integraph_ giving the value of a definite integral as function of a _variable parameter_."
• "In Coradi's integraph a rectangular frame F_1F_2F_3F_4 (fig. 22) rests with four rollers R on the drawing board, and can roll freely in the direction"