1. Lewis and Clark
... positions "St. Louis, the Mandan Indian villages on the upper Missouri, and the mouth of the Columbia River. Lewis had to fill in the map by measuring latitude and longitude at places along the route. He had to learn to use a sextant to determine latitude and had to use a special clock called a chronometer for ... longitude. For medicine preparation, Lewis went to Dr. Benjamin Rush. Rush was the most famous physician in America at the time. He believed that there were two things that could cure ... the Three Forks. On April 25, 1805, day 347, Lewis set off with a few others to find th...
- Word Count: 3902
- Approx Pages: 16
- Grade Level: High School