noun. An instrument for measuring the area under a curve combined with a recording device which draws the integral curve of the curve traced by the point of the instrument; an integrator.

noun. An instrument for determining the value of an indefinite integral.

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

"Boys 'integraph was invented during a sleepless night, and during the following days carried out as a working model, which gives highly satisfactory results."

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