This stone was among the tools Charles Lindbergh and his wife, Anne Morrow Lindbergh, took on their 1933 survey flights across the North and South Atlantic. They used it to service the aircraft's magneto points, electrical generators which provide power to the spark plugs (and are more reliable than batteries). This was just one of several maintenance tasks they had to perform to keep their airplane running properly.In December 1933, during the latter part of their trip, the Lindberghs made several unsuccessful takeoff attempts for their flight from Africa to South America as calm winds and seas would not allow their heavily loaded plane to rise. This stone was among the tools and supplies they removed and shipped home from Bathurst, Gambia so they could lighten their load and continue.