K&E 4246 ----- Pantograph Polar Plainimeter
From the collection of John Eggers
Check out the Planimeter Gallery of John Eggers
This instrument is unique in that it is a combination of a planimeter and a pantograph effectively having two ranges when used as a planimeter. One tracing point is idealized for large objects while the other can be used for smaller circles. Replacing one of the points with a pencil point makes the instrument a pantograph.