Multimedia Gallery
- Topic: Navigating At Sea
Map produced by the U.S. Exploring Expedition
Marine chronometers are precise, specialized clocks for finding longitude at sea. They serve as portable time standards.
Chronometers like this one by Arnold & Dent were used on the U.S. Exploring Expedition (1838-1842).
Chronometers like this one by Charles Frodsham were used on the U.S. Exploring Expedition (1838-1842).
Chronometers like this one by Molyneaux & Son were used on the U.S. Exploring Expedition (1838-1842).
Chronometers like this one by Parkinson & Frodsham were used on the U.S. Exploring Expedition (1838-1842).
Tradition says this was the first American-made marine timekeeper taken to sea.
A mariner’s astrolabe measures the angle of the Sun or a star above the horizontal line of reference.
Mask, Oregon Territory
Mice, Funafuti Atoll (Mus exulans, Mus vitiensis)
