出典:Wikipedia
出典:『Wikipedia』 (2010/12/24 22:31 UTC 版)
The Equatorial Sextant , also known as Altitude Instrument, was first invented and made by William Austin Burt. He patented it November 4, 1856, in the United States as patent No. 16,002, which was followed by patents in England, France and Belgium. The purpose of this type of sextant was to get an accurate position of a ship at sea. Burt applied the principles of his earlier Solar Compass invention to navigation.