Inventions
The Turtle Ship was invented by Admiral Yi. This was a new design for ships of the time. It had metal spikes on the top of the ship so invaders would not jump onto the ship. The design of the retractable doors on the sides of the ship were used to hold the cannons. Also huge oars were placed on the sides of the ship. This ship helped them better protect themselves against attackers.
Korea's first rain gauge was invented by Jang Yeong-sil. This helped regulate the rainfall for agriculture. In Korean it is called cheokugye.
Jang Yeong-sil developed a Korean sundial. This invention helped people tell what time it was. It was made of bronze and was bowl-shaped. These sundials were placed strategically in public areas so that everyone could know what time it was.
The iron printing press was a huge advancement made by Jiphyeonjeon scientists. This invention had more precision than any printing devices before it. Also printing was substantially faster with the iron printing press.
The hwacha was used alongside the turtle ship when Korea was in conflict with Japan(mid-Sixteetnth century). The inventor is unknown, but this weaponry was deadly. They would attach explosives to arrows and light them on fire then shoot them out of their wheelbarrow device. This weapon was useful in fighting off the Japanese.
Mythbusters hwacha demonstration
http://www.youtube.com/watch?v=PvrVwtBsgM0
http://www.youtube.com/watch?v=PvrVwtBsgM0