Survey and observations
On the expedition’s final day encamped at the mouth of the Ohio, Clark completes his survey of that river’s confluence with the Mississippi, and Lewis makes celestial observations.
Mouth of the Ohio
View south, from Fort Defiance
© 2022 by Robert Heacock. Used by permission.
at the mouth of the Ohio we delayed five Days in which time I made a Complete Survey of the place . . . .
—William Clark[1]James J. Holmberg, ed. Dear Brother: Letters of William Clark to Jonathan Clark (New Haven: Yale University Press, 2002), 60.
Took equal altitudes . . . .
Altitude Art. Horzn. & Sectns. 41° 26′ 37″ Sextant Error 8′ 45″—
Altitude given by sextant
‘s center 39° 50’ 00″
Equal altitudes corrected
Chronometer too slow
—Meriwether Lewis
Notes
| ↑1 | James J. Holmberg, ed. Dear Brother: Letters of William Clark to Jonathan Clark (New Haven: Yale University Press, 2002), 60. |
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