Preparations Continue at Pittsburgh
Still delayed in Pittsburgh waiting on his keelboat, Lewis spent the day organizing the scientific instruments that would be vital for charting unknown territory, including a chronometer, sextant, compass, and thermometer. His preparation drew on training he had received earlier that spring in Philadelphia, where President Jefferson had arranged for him to study under Andrew Ellicott, one of the country's leading astronomers, to ensure he could accurately take astronomical and geographical observations during the expedition.
Lewis continued the frustrating wait in Pittsburgh. He occupied himself with organizing the expedition’s scientific instruments, which included a chronometer, sextant, compass, and thermometer — tools essential for mapping the uncharted territory ahead.
President Jefferson had personally instructed Lewis in the use of these instruments during training sessions in Philadelphia earlier that spring with Andrew Ellicott, one of America’s foremost astronomers.
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Lewis continued the frustrating wait in Pittsburgh. He occupied himself with organizing the expedition's scientific instruments, which included a chronometer, sextant, compass, and thermometer — tools essential for mapping the uncharted territory ahead.
President Jefferson had personally instructed Lewis in the use of these instruments during training sessions in Philadelphia earlier that spring with Andrew Ellicott, one of America's foremost astronomers.
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