Ed Collen, a NASA engineer, built this prototype device as a backup for Apollo astronauts in case their primary navigation system failed.
Malay Dagger and Sheath, Indonesia
These tools were critical for quickly accessing distances and plotting courses.
Striking green ornaments made by the Maori were created from a kind of jade.
Chronometers like this one by Arnold & Dent were used on the U.S. Exploring Expedition (1838-1842).