The pantograph

Perhaps the most famous linkage is the pantograph. This is used to enlarge and reduce drawings.

One form is shown below. Move the point C, and watch the resulting point A. Note that B is assumed to be fixed to the table.

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and activated. (click here to install Java now)

Chris Sangwin, 27 December 2006, Created with GeoGebra