An Integraph is an instrument used in mathematics for plotting the integral of a graphically defined function.

How does it work :

Trolley 1 move from left to right thanks to the input stylus and slides, the main arm is connected to the trolley 1 thanks to a slide. Then the angle of the arm depends on abscissa position of the input stylus. The trolley 2 move on the main arm. The parallelogram is connected to the trolley 2. The parallelogram is connected to the tangent wheel. Thefore the angle of the wheel depends on the angle of parallelogram. Consequently, the angle of the tangent wheel depends on abscissa position of the input stylus.

The parallelogram enables the tangent wheel to always have the same angle, despite the position of the trolley. If the tangent wheel has the same angle of the displacement : trolley 3 doesn’t move. If the tangent wheel hasn’t the same angle : trolley 3 moves. The conjonction of the tangent wheel and the displacement of the troley 3 is the trick to plot the integral.

To resume : The conjonction enables the device to plot integral because the wheel is always tangent to the curve and the angle depends on the abscissa position of the input stylus.

The result : y=x and trignometric circle integral.

October 22nd, 2014 on 18 h 07 min

In School, wie learnd last month about functions. The integraph is a very gold help! Thank you, Nico71!

March 10th, 2011 on 14 h 09 min

Hello, I will make picture instructions as soon as possible. Stay tunned onmy website

March 7th, 2011 on 21 h 36 min

Instructions?

March 6th, 2011 on 14 h 03 min

Quite impressive!

I would be proud to be able to make such a contraption!

February 17th, 2011 on 15 h 23 min

COOL!!!

Good job!