They Invented What? (No. 39)

U.S. Pat. No.6,702,582:  Device and method for solving circles.

JW Note:  In honor of Pi Day.  We hope you celebrated on time (3/14 at 1:59 PM . . . Einstein’s Birthday).

 

What is claimed is:

1. A device for visually demonstrating a characteristic of a circle, comprising: a cylindrical container having a body and a lid fitted thereon with at least three projections, a first projection located at a point on a circumference of a circle defined by an upper surface of said lid, a second projection in a center of said circle, and a third projection on the circumference of said circle opposite said first projection and in linear alignment with said first and second projections across a diameter of said upper surface; and a string attached at one end to said lid adjacent said first projection and having a length at least equal to the circumference of said lid.