patents, it might bo m- j teresting to know that Abraham Lincoln | was an inventor and received a patent onMay 22, 1S4D, numbered (5,869, for an im-proved means of combining adjustable buoy-ant air chambers with steamboats or othervessels to enable their draught to be readily lessened to permit… … steamboat) and were formed with top andbottom partitions composed of a plank orplate of metal of suitable stiffness and withflexible side portions of India rubber ortextile material thoroughly water-proofed.-These buoyant air chambers were vary simi-lar in construction and operation to an…
