JAKARTA - Pigyokjinchonroe is a cannonball with an axis made and used by the ancestors of the Korean people during the Imjin Patriotic War. The Imjin Patriotic War was a war against Japanese aggressors between 1592 and 1598.
The name Pigyokjinchonroe comes from the meaning, it shakes the heavens and the earth when it is fired to explode.
"The Pigyokjinchonroe was created in the development of various cannons already used by our ancestors," said Doctor and Professor Kang Se Gwon, head of the Historical Institute under the Academy of Social Sciences, quoted from Defendkorea January 27.
This weapon was invented by Ri Jang Son, a weapons technician in the Joseon Dynasty (1392-1910), for the first time before being used in the battle of Kyongju Fort during the Imjin Patriotic War.
Pigyokjinchonroe which looks like a ball, are divided into several different ones according to their diameter and outer mass. Pigyokjinchonroe can time the explosion earlier or slow it down like a ticking time bomb according to the length of its wick.
Can be fired from various types of cannons, the range of this time bomb reaches 750 meters to 900 meters. The explosion of the cannonball was like thunder and shook the earth, so it was called pijinchonroe or jichonroe.
Casted with iron, the cannonball had a small hole through which black powder was fed. The fuse is installed around the ball and filled with caltrop. Then the hole is closed with an iron cap, and the screw box is connected to the lid.
The screw box must be fixed with two screw holders with ten and 15 grooves respectively. A fuse is inserted in each groove. Thus, the cannonball had to be fixed with a ten-groove screw mount for the bomb to explode immediately, after being fired or a 15-groove one to explode shortly after being fired.
Pigyokjinchonroe is known in the history of the cannon world as a cannonball with a wick and the first form of a time bomb. It showed great power in clearing the invaders and inflicting great terror on the enemy during the Imjin Patriotic War.
According to KCNA, the weapon was first used in the battle to retake Kyongju Fort in September 1592.
Commenting on pigyokjinchonroe a Japanese weapons scientist said, "What is clever about this bomb is its fuse. It must have been something of a shock at that time (the Imjin Patriotic War)."
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