Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A device that determines the value of an integral by measuring the area under a curve (and drawing the curve of its integral)
from The Century Dictionary and Cyclopedia
 n. 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.
 n. An instrument for determining the value of an indefinite integral.
Etymologies
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Examples

Boys 'integraph was invented during a sleepless night, and during the following days carried out as a working model, which gives highly satisfactory results.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

The instrument now is an _integraph_ giving the value of a definite integral as function of a _variable parameter_.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

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
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

AbdankAbakanowicz's work, actually made an integraph which was exhibited at the Physical Society in 1881.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

[Sidenote: Integraphs.] mere constant, an integraph gives the value of an indefinite integral, which is a function of x.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

The object of the integraph is to draw this new curve when the tracer of the instrument is guided along the ycurve.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

Hence we introduce an arbitrary constant length a, the unit to which the integraph draws the curve, and write dY/dx = y/a and aY = [Integral] ydx.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

Sometimes a combination of graphical work with an integraph will serve the purpose.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

If we write au = [Integral] Xdx, av = [Integral] Ydy, then u as a function of x, and v as a function of y can be graphically found by the integraph.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"

The apparatus called an integraph, constructed by Messrs. Napoli and
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