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2.5 船舶、海洋领域对于船舶来说,有需要具备完全独立能力的远洋船和无需具备这种能力的舟艇。就远洋船而论,在19世纪50年代,由于Be-ssemer和Siemens公司开发的炼钢法,使得轧制钢材成为可能,因而,木船的钢铁化及大型化得以飞速发展,其后,加之蒸汽机和内燃机的发明以致现在甚至出现了载重量达50万吨的油轮。另一方面,舟艇是具有远洋船辅助的意义的船,所以一般具有小型、高速的特点.舟艇之中,有内河航行及沿海航线的小型船,
2.5 For ships and oceans There is a need for ocean-going vessels that are completely independent and ships that do not need such capabilities. As far as ocean-going vessels are concerned, in the 1850s, steelmaking was made possible by the steel-making method developed by Be-Ssemer and Siemens, which led to the rapid development of steelmaking and large-scale wood-based vessels. Subsequently, And the invention of the internal combustion engine so that even today there have been shipments of up to 500,000 tons. On the other hand, the boat is a boat with the aid of a seagoing vessel, so it generally has the characteristics of small size and high speed. Among the boats, small boats with inland navigation and coastal routes,