Jack Plane With An Extension
![jack-plane-with-extension jack plane with extension](https://www.innovation-creativity.com/wp-content/uploads/2020/05/jack-plane-with-extension.jpg)
A jack-plane with an extension on one side. By sliding the extension along the face of a board, you could keep the edge square while you planed it.
By Donald Snyder, Canton, Ohio.
February 1958
You can purchase a modern-day Jack Plane from Amazon. (affiliate link)