Existing comment:
Air Mail Pilot's Knee Board and Map
Joseph L. Mortensen navigated the air mail route from Salt Lake City, Utah, to Reno, Nevada, in 1920 using this scrolling map and knee board.
Did You Know?
This object is called a "knee board" because a pilot would strap it to his leg. He would turn the knobs to scroll the map as he flew his route. Why would this be more useful than a folding map? |