Illustration from 1911 Encyclopædia Britannica, article CALCULATING MACHINES.
In Coradi's integraph a rectangular frame F1F2F3F4 (fig. 22) rests with four rollers R on the drawing board, and can roll freely in the direction OX, which will be called the axis of the instrument. On the front edge F1F2 travels a carriage AA′ supported at A′ on another rail. A bar DB can turn about D, fixed to the frame in its axis, and slide through a point B fixed in the carriage AA′. Along it a block K can slide. On the back edge F3F4 of the frame another carriage C travels. It holds a vertical spindle with the knife-edge wheel at the bottom. At right angles to the plane of the wheel, the spindle has an arm GH, which is kept parallel to a similar arm attached to K perpendicular to DB. The plane of the knife-edge wheel r is therefore always parallel to DB.
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This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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Illustration from 1911 Encyclopædia Britannica, article CALCULATING MACHINES. In Coradi's integraph a rectangular frame F<sub>1</sub>F<sub>2</sub>F<sub>3<sub>F<sub>4</sub> (fig. 22) rests with four rollers R on the drawing board, and can roll freely in