기리고차(記里鼓車, girigocha) - Korean traditional distance measuring carriage

thingiverse

[parts list] 1. axis_hitrod_bell.stl x1 2. axis_hitrod_drum.stl x1 3. axis1.stl x1 4. axis2.stl x1 5. axis3.stl x1 6. axis4.stl x1 7. axis5.stl x1 8. axis2support.stl x1 9. axis3support.stl x1 10. axis4support.stl x1 11. axis23support.stl x1 12. axis45support.stl x1 13. bell.stl x1 14. bell_stand.stl x1 15. hitrod_bell.stl x1 16. drum.stl x1 17. drum_stand.stl x1 18. hitrod_drum.stl x1 19. gear1.stl x1 20. gear2.stl x1 21. gear3.stl x1 22. gear4.stl x1 23. gear5.stl x1 24. gearbox_top.stl x1 25. gearbox_wall1.stl x2 26. gearbox_wall2.stl x2 27. handrail_gearbox1.stl x2 28. handrail_gearbox2.stl x2 29. handrail_rater_seat1.stl x2 30. handrail_rater_seat2.stl x2 31. rater_seat.stl x1 32. bottom_plate.stl x1 33. driver_seat.stl x1 34. washer.stl x2 35. wheel.stl x2 In our country, we have taken the distance between regions and represented it as ri (里數) since ancient times. The method of measuring distance has varied by era, but the most accurate method in modern times is using a long ruler. This measurement method requires a lot of labor, making it a primitive way. On March 17, 1441, during the reign of King Sejong, he rode a carriage pulled by horses for the first time at Gama-gol (加麞谷) while visiting the hot springs in Onsu County. The cart was actually a distance-measuring device called the kilogoche (기리고차), which measured the distance traveled. The kilogoche was an automatic distance measurement device that used a wooden figurine to strike a drum when it reached 1 ri, and a bell rang every 10 ri. Its structure is not yet known, but its mechanism is detailed in the Song Dynasty's historical records. When the wheel with a circumference of 18 shaku (尺) rotated, the rotation was transmitted through a toothed wheel to calculate the number of revolutions, and when it reached 100 revolutions, the wooden figurine struck a drum to signal that 1 ri had been traveled. During King Sejong's reign, Jang Yeong-sil received a royal decree to study in China and return with his knowledge. In 1434, he completed the self-striking clepsydra (자격루), and in 1438, he completed the jade clepsydra (옥루). If such mechanical devices were created, it would have been easy to make the kilogoche's mechanism as well, so this is also attributed to Jang Yeong-sil. It is estimated that the kilogoche during King Sejong's reign was a wheel with a diameter of 119.15 cm (19.35 shaku), which measured 1 ri every 100 revolutions. The number of rotations was automatically calculated through a toothed wheel.