Jang Yeong-sil
Template:Short description Script error: No such module "For". Template:Family name hatnote Template:Infobox Chinese/HeaderTemplate:Infobox Chinese/KoreanTemplate:Infobox Chinese/Footer
Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Template:Infobox Korean name/categories Jang Yeong-sil (Korean: Script error: No such module "Lang".; Hanja: Script error: No such module "Lang".Template:Category handler; Script error: No such module "IPA".; ? – after 1442) was a Korean mechanical engineer, scientist, and inventor during the Joseon dynasty. He was born to a mother who was a government-registered courtesan (Script error: No such module "Lang".; Script error: No such module "Lang".Template:Category handler) and a father of Yuan dynasty descent.[1] Although Jang was born a nobi, King Sejong gave him a court-technician position in the royal court.
Jang's inventions, such as the Cheugugi (the rain gauge) and the water gauge, highlight the technological advancements of the Joseon dynasty.
Early years
Jang Yeong-sil's precise date of birth is unknown and only recorded in the genealogy of the Jang family[2][3] and his ancestry in the Veritable Records of the Joseon Dynasty.[4] According to these records, his father, Jang Seong-hwi, was the eighth generation of the Jang family.[5][6] Jang Seong-hwi was the third of five brothers, all of whom previously served as ministers in Goryeo. Historical records also mention his elder brother, Jang Seong-bal, who was born in 1344 and whose grave is located at Ui-seong in North Gyeongsang Province.[7] Yeong-sil's mother was a government-registered courtesan, making Jang a government-owned nobiTemplate:Snda type of Joseon's lowest class.Template:Sfn
Civil service
Jang's fame gained him entry into the royal court in Hanseong (present-day Seoul), where select commoners displayed their talents before the king and his advisers. Sejong was impressed by Jang's craft and engineering skills and allowed Jang to work as a court technician in the palace.Template:Sfn The talented scientists recruited under Sejong's new program worked at the Hall of Worthies.[8]
Astronomical instruments
Jang was tasked to build a celestial globe to measure astronomical objects. Books obtained from Arabian and Chinese scholars contained incomplete instructions, for these devices could also be used for military purposes. After two months of study, Jang made a spherical device that performed with mediocre accuracy. In 1433, a year after his first attempt, Jang made an armillary sphere known as the honcheonui (Script error: No such module "Lang".; Script error: No such module "Lang".Template:Category handler). Honcheonui depended on a waterwheel to rotate the internal globe to indicate time.Template:Sfn Whether day or night, this allowed the instrument to be updated on the positions of the sun, moon, and the stars.Template:Sfn Later celestial globes (gyupyo (Script error: No such module "Lang".Template:Category handler)) could measure time changes according to the seasonal variations.Template:Sfn These instruments, along with the sundials and water clocks, were stationed around the Gyeonghoeru Pavilion in Gyeongbok Palace and put into use by the astronomers.[9] The success of Jang's astronomical machines was marked in 1442 AD when the Korean astronomers compiled their computations on the courses of the seven heavenly objects (five visible planets, the sun, and moon) in Chiljeongsan (Script error: No such module "Lang".Template:Category handler), an astronomical calendar that made it possible for scientists to calculate and accurately predict all the major heavenly phenomena, such as solar eclipses and other stellar movements.[10]
Iron printing press
Although Ch'oe Yun-ŭi invented the world's first metal printing press in 1234 during the Goryeo period, Sejong asked scientists at Jiphyeonjeon to build a better printing press. In 1434,[11] scientists accomplished building Gabinja (Script error: No such module "Lang".; Script error: No such module "Lang".Template:Category handler),Template:Sfn which was made of copper-zinc and lead-tin alloys.[12] It was said to be twice as fast as the previous printing presses and printed Chinese characters in astounding beauty and clarity. Gabinja was reproduced six times during the next 370 years.[12]
Water clock
Samguk Sagi records that an office overseeing the use of water clocks had been established during the Three Kingdoms period. The Korean water clock consisted of two stacked jars of water, with water dropping from the top to the bottom at a measured rate. The level of the water indicated the time of the day. This was very inconvenient because a person had to be always be on guard, so that a drum could be banged at each hour to inform the public of the current time.
Self-striking water clocks were not new, having already been invented by the Arabians and the Chinese (in 1091).Template:Sfn Upon hearing about the usage of self-striking water clocks in foreign countries, Sejong assigned Jang and other scientists to build a clock emulating such automatic devices. After their initial attempts failed in developing an operational water clock, Jang traveled to China to study the various designs of water clocks. When he returned in 1434, Jang created Korea's first self-striking water clock, the Jagyeokru (Script error: No such module "Lang".Template:Category handler), which would mark the hour automatically with the sounds of a bell, gong, and drum, and was used to keep the standard of time in Joseon.Template:Sfn This water clock was not preserved well and did not survive; however, reconstructions of the Jagyeokru based on text descriptions have been made.
Circling the clock were 12 wooden figures that served as indicators of time. There were 4 water containers, 2 jars that received the water, and 12 arrows floating inside the lower container. As the water from the upper containers seeped down the pipe to the lower container, one of the arrows would tilt a board filled with small iron balls; a ball would roll down a pipe to a container of larger iron balls. The collision would cause the larger balls to travel down a lower pipe and hit a giant cymbal, announcing the time to the community. A ball would then land on another container, which was part of a complex system of levers and pulleys that moved wooden figures to indicate the time visually.Template:Sfn
Sundial
Jang's invention of the water clock saw the start of its use throughout the country, however, these water clocks were very costly. Development of the sundial provided a cheaper and more manageable alternative. Jang, Ichun, Kimjo, and other scientists made Korea's first sundial, the Angbu-ilgu (앙부일구/Script error: No such module "Lang".),Template:Sfn which meant "pot-shaped sun clock staring at the sky".[13] Angbu-ilgu was bronze in composition, and consisted of a bowl marked with 13 meters to indicate time and 4 legs jointed by a cross at the base.[13] Seven lines crossed the 13 meters in different curves to compensate for the seasonal changes of the course of the sun.[13] Angbu-ilgu and other variants, such as the Hyeonju Ilgu (현주일구/Script error: No such module "Lang".) and the Cheonpyeong Ilgu (천평일구/Script error: No such module "Lang".), were implemented in strategic spots, such as the town's main streets with heavy traffic, so that the people could be well informed of the time. To compensate for the high illiteracy rate among the commoners, 12 shapes of the Chinese zodiac were engraved in juxtaposition with the meters.[13] No sundials from the Joseon dynasty made during King Sejong's reign still exist today; none are known to have survived past the Japanese invasions of Korea (1592–1598) (임진왜란).
Research on weaponry
When Sejong learned of reports that Korean melee weapons were duller and somewhat heavier than those of the neighboring countries, he sent Jang to Gyeongsang Province, where Jang had spent his earlier life developing metal alloys for various weapons and tools. Since Jang used to be a gwanno (관노/Script error: No such module "Lang".) (a man-slave in government employ), he had already acquired much knowledge about metal working, and also knew the geography of the area. Jang surveyed the available metals and their characteristics, and presented his research to Sejong and the generals, contributing to the development of Korean weaponry.Template:Sfn
Rain gauge
The Korean economy during the Joseon dynasty was agriculturally based and vulnerable to prolonged or consecutively occurring droughts; therefore, there was a need for better ways to manage water. Although rain gauges had been used in ancient Greece and India,[14] Jang invented Korea's first rain gauge in 1441, called cheugugi (측우기/Script error: No such module "Lang".),Template:Sfn[15][16][17][18] and, by 1442, a standardized rain gauge with dimensions of 42.5 cm (height) and 17 cm (diameter) was introduced throughout the country to gather data on the yearly averages of precipitation throughout the different regions of the country.[8]
Water gauge
To allow better water management, Sejong asked the scientists to figure out some ways to inform the farmers of the available amount of water; and, in 1441, Jang invented the world's first water gauge, called Supyo (수표/Script error: No such module "Lang".). It was a calibrated stone column placed in the middle of a body of water, connected by a stone bridge.Template:Sfn
Expulsion
Jang's extraordinary accomplishments earned him the trust of Sejong. Some government officials were very jealous of Jang, especially when he had achieved so much despite his common origin.
In 1442, Sejong ordered Jang to build a gama, an elaborately decorated Korean sedan chair. The gama broke while Sejong was traveling, and Jang was held responsible. Although Sejong was against the decree, Jang was jailed for an extended period of time and expelled from the royal palace. Later events of Jang's life, including the date of his death, were not recorded.Template:Sfn It is unlikely, but possible that Jang Yeong-sil may have died during the reign of Joseon's 7th king, Sejo of Joseon (r. 1455–1468).
Popular culture
- Portrayed by Lee Chun-hee in the 2008 KBS2 TV series The Great King, Sejong.
- Portrayed by Im Hyung-joon in the 2012 film I Am the King.
- Portrayed by Kim Seul-gi in the 2015 MBC TV series Splash Splash Love.
- Portrayed by Song Il-gook in the 2016 KBS1 TV series Jang Yeong-sil.
- Portrayed by Choi Min-sik in the 2019 film Forbidden Dream.
Tribute
On May 19, 2018, Google celebrated Jang Yeong-sil with a Google Doodle.[19]
See also
References
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- ↑ Script error: No such module "citation/CS1".
- ↑ "The genealogy of A-san Jang-si", book 1, pp.4, 1872, (牙山蔣氏世譜卷之一黃)
- ↑ Jonghwa Ahn, Kook-Jo-In-Mool-Ji, 1909, 國朝人物志 v.1, A biographical dictionary of Korea
- ↑ Veritable Records of the Joseon Dynasty, King Sejong Section, 16 September 1433
- ↑ Dae-Dong-Woon-Boo-Goon-Ok, 1587, 大東韻府群玉
- ↑ Script error: No such module "citation/CS1".
- ↑ Moon-Ik-Gong Sillok, 1738
- ↑ a b Korean History Project Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
- ↑ Introduction to the Folk Museum Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Federation of Busan and Technology Template:Webarchive
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ The Culture and Civilization of Ancient India in Historical Outline; Kosambi, 1982
- ↑ Visit Busan Museum GuideScript error: No such module "Unsubst".
- ↑ American Meteorological Society press
- ↑ Script error: No such module "citation/CS1".
- ↑ Friendly Korea brief on Korean history Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
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Sources
- Script error: No such module "citation/CS1".