So apparently a lot of people search for protractors…I have had an average of 50 people/day coming to my blog from searching for protractors. For all of you out there that enjoy protractors, this one’s for you…
An instrument used to construct and measure plane angles. The simple protractor looks like a semicircular disk marked with degrees, from 0º to 180º. The simple protractor is an ancient device. The first complex protractor was created for plotting the position of a boat on navigational charts. Called a three-arm protractor or station pointer, it was invented in 1801, by Joseph Huddart, a U.S. naval captain. The center arm is fixed, while the outer two are rotatable, capable of being set at any angle relative to the center one.
Also check out – http://www.ehow.com/video_4977255_who-invented-protractor.html