HALDEN CALCULEX CIRCULAR SLIDE RULE

This intricate measuring device, three inches in diameter, belonged to Robert Fletcher, the first director and dean of Thayer School of Engineering. He was also the only Thayer instructor for five years. Founded in 1867 by Brig. Gen. Sylvanus Thayer, class of 1807 and the so- called “Father of West Point,” the school was originally known as the Thayer School of Civil Engineering. The school has grown from its first class of three students to a current enrollment of more than 350, thanks in part to the building of its own facility in 1938.