gitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Protocols Protocols in his new route which shall be new. He has qualified himself for those observations of longitude & latitude necessary to fix the line he will go over. Thomas Jefferson to Dr. Benjamin Rush of Philadelphia on why he picked Meriwether Lewis for the Corps of Discovery Six papers of ink powder; sets of pencils; "Creyons," two hundred pounds of "best rifle powder"; four hundred pounds of lead; 4 Groce fishing Hooks assorted; twenty-five axes; woolen overalls ad other clothing items, including 30 yds. Common flannel; one hundred flints; 30 Steels for striking or making fire; six large needles and six dozen large awls; three bushels of salt. Partial list of items purchased by Lewis for the trip When Meriwether Lewis and William Clark left St. Louis with the Corps of Discovery in 1803 to travel up the Missouri and Columbia Rivers to the Pacific Ocean, they had no idea how to get where they were going. They traveled with and relied on a massive collection of maps, instru- ments, transcripts of interviews with trappers and Native American guides, an awful lot of courage, and the knowledge of Sacagawea-the wife of independent French-Canadian trader Toussaint Charbonneau, who accompanied them on their journey. As they made their way across the wilderness of the Northwest, they marked trees every few hundred feet by cutting away a large and highly visible swath of bark, a process known as "blazing." By blazing their trail, others could easily follow them without the need for maps, trapper lore, or guides. They did not need to bring compasses, sextants, chronometers, or to hire local guides; they simply followed the well-marked trail. If you understand this concept, then you also understand the concept of connection-oriented switching, sometimes called virtual circuit switch- ing, one of the two principal forms of switching technologies. When a device