Читать книгу Robert Fulton and the Submarine онлайн

23 страница из 48

Van Drebbel, a Dutch engineer, born in Holland in 1572, made actual application of Bourne’s ideas, and constructed a submersible boat in 1624. He tested it in 15 feet of water in the Thames at London, during one of which tests it is reported that he had King James I. as a passenger. Apparently he attempted propulsion by means of oars that passed through the boat’s sides, the apertures being covered by leather pockets attached to oars and boat. What plan he had for keeping the boat’s air respirable when submerged is not clear, though there are some fantastic but not authenticated claims that he used a chemical compound for refreshing it. If he really plunged, which is by no means certain, it was probably for only a few minutes at a time.

In 1634, the same year in which Van Drebbel died in London, there was published a book entitled, “Hydraulica Pneumatica,” containing a chapter “De nauibus sub aqua natantibus.” This interesting work was written by a noted French theologian and philosopher, Marin Mercenne (1588–1648), a member of the order of Minimes Fathers. As was frequently done at that period in the case of technical treatises, Father Mersenne wrote his book in Latin, and gave his name the latinized form of Mercennus. He describes Drebbel’s boat, but credits Bourne with having first proposed the principles that Drebbel used, and recalled that Bourne had suggested the possibility of getting fresh air through tubes reaching to the surface. Mercenne’s contribution to the art was his stated belief that the compass would be equally efficient beneath as well as on the surface.