Did you ever ride a submarine? Perhaps most have not, just like me. But do you know the history of the submarine and periscope? Here is his review:

In about 1578, William Bource, a mathematician from the UK, to design a shape of a submarine. These ships are small and tightly closed. The material is made of wood covered with a type of skin and does not penetrate the water. Wow, who would have thought with simple materials that can be made submarine.

Around 1620, Cornelius van Drebbel of the Netherlands is regarded as the first to make the submarine and successfully launch it. Actually, the concept of the framework is still the same submarine with artificial Willian Bource. Submarine Cornelius still using wood and leather-coated exterior use oil paint lubricated to be water resistant. The submarine is also enough for one person only.

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