artificial Horizon
Tool · mentioned in 2 journal entries
Planning
Westward
Fort Clatsop
Return
Post-expedition
NPS L&C NHT trail data © National Park Service
AI-extracted reference. Each entry below was identified by AI as mentioning artificial Horizon. Spelling variants may not be merged. see related variants →
Lewis: January 26, 1805
Meriwether Lewis · Jan 26, 1805 · Fort Mandan (winter)
"water-based horizon for sun observation"
— transcribed as artificial horizon
Clark: August 25, 1806
William Clark · Aug 25, 1806 · Bad River confluence, Pierre, South Dakota – Teton Sioux encounter
"used with sextant for observation"
