Lost Technology

2014131021 Takamitsu Sakai

What is Lost Technology？

It is the technology that has been lost by some kind of reasons in the present age

out-of-place-artifacts

Crystal skeleton　　　→

There is the opinion it is the imitation.

Factor of the outbreak

A successor disappears, and a technique is lost.

The base of the technique disappear by an environmental change.

By development of different technology, it decline.

Old Japanese sword

"An old Japanese sword" means swords from the Heian era to the Sengoku era.

Mystery of the old Japanese sword

How do it was made？

History of the Japanese sword

Damascus steel

←　 Indian dagger using the Damasucus steel

Mystery of the Damascus steel

How do it was made？

Why is it hard to be rusted？

“Pillar of Delhi” in IndiaThis is said to be made of Damascus steel

The other Lost Technology

←　　 Greek fire

Roman aqueduct　　　→

Reference materials

http://ohmura-study.net/003.html

http://www.nittech.co.jp/M99/M9906.html

http://ja.wikipedia.org/wiki/%E3%82%AE%E3%83%AA%E3%82%B7%E3%82%A2%E7%81%AB%E8%96%AC