The compass opened the world to discovery. Invented in China thousands of years ago, it was introduced to Europe in the 1400s, ushering in a new era of exploration. Thomas Jefferson owned several, including a surveyors compass and a pocket compass he carried on his daily rides. This one, with its handsome brass case, is modeled on antique originals. Great for the young explorer. 1 3/4" dia. x 3/8" thick.