The sextant, invented in the 18th century by British mathematical instrument makers, became the most essential instrument for celestial navigation. Jesse Ramsden, who made this sextant, also devised a machine to divide the scale on the sextant very precisely. Courtesy of the Air and Space Museum
In honor of its exhibit opening April 12, the Air and Space museum hosted journalists and social media friends for a behind-the-scenes tour of the exhibit. From early navigation at sea and skies and to outer-space and back again, the exhibit spans hundreds of years of technological change.
Kennewick Man: The Scientific Investigation of an Ancient American Skeleton (Peopling of the Americas Publications) [Douglas W. Owsley, Richard L. Jantz] on Amazon.com. *FREE* shipping on qualifying offers. Almost from the day of its accidental discovery along the banks of the Columbia River in Washington State in July 1996
The Smithsonian's History of America in 101 Objects [Richard Kurin] on Amazon.com. *FREE* shipping on qualifying offers. The Smithsonian Institution is America's largest, most important, and most beloved repository for the objects that define our common heritage. Now Under Secretary for Art