Any visitor to Thomas Jefferson’s home at Monticello knows of Jefferson’s wide-ranging interests, and work in science and invention. I was rather surprised to discover the depth of George Washington’s inventive work, in a seminar sponsorred by the Bill of Rights Institute at Mount Vernon a few years ago.
Abraham Lincoln, too?
Lincoln lived along the Sangamon River, and he saw development of the river for commercial navigation to be a boon for his district’s economic growth. Unfortunately, the Sangamon is not deep; boats had difficult times navigating over the many logs and snags, and shallows.
So, Mr. Lincoln offered a technical solution, for which he was granted a patent in 1849. Details below, from Google Patents: