The Eidograph

The Enlightenment! programme recently purchased an eidograph, a form of pantograph, made by John Davis and possibly used by the Midland Railway in Derby. The first pantograph was constructed in 1603 by Christoph Schiener, who used the device to re-create diagrams and enlarge, but he wrote about the invention over 27 years later, in “Pantographice” (Rome 1631). One arm of the pantograph contained a small pointer while the other held a drawing implement, and by moving the pointer over a diagram, a copy of the diagram was drawn on another piece of paper. By changing the positions of the arms in the linkage between the pointer arm and drawing arm, the scale of the image produced can be changed. A more complicated version called the eidograph was developed by William Wallace in 1831.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: