2003 Fiscal Year Final Research Report Summary
A comparative study on historical technology of metalwork using scientific methods
| Project/Area Number |
13480031
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Cultural property science
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| Research Institution | National Museum of Japanese History |
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Principal Investigator |
UDAGAWA Takehisa National Museum of Japanese History, Museum Science Department, Professor, 情報資料研究部, 教授 (70104750)
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| Co-Investigator(Kenkyū-buntansha) |
KOSETO Emi National Museum of Japanese History, Museum Science Department, Research Associate, 情報資料研究部, 助手 (80332120)
SAITO Tsutomu National Museum of Japanese History, Museum Science Department, Associate Professor, 情報資料研究部, 助教授 (50205663)
SUGIYAMA Shinsaku National Museum of Japanese History, Archaeology Department, Associate Professor, 考古研究部, 助教授 (30150022)
HARADA Kazutoshi Tokyo National Museum, Special Research Chair, 上席研究員 (20141989)
ASAOKA Koji Okinawa Prefectural University of Arts, University President, President, 学長 (60072162)
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| Project Period (FY) |
2001 – 2003
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| Keywords | matchlock gun / riffle / inclusion / scanning electron microscope / metallography / manufacturing technique / decarburization / ballistics |
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| Research Abstract |
We compared the manufacturing technique of iron materials of swords and guns made in different areas, schools and ages. The Scientific methods we used were chemical analysis of inclusion and metallographical observation using a scanning electron microscope, and ballistic measurement The results areas follows;
1.From the direction of ended inclusion we can distinguish two manufacturing-methods written in old documents, i.e. Udon-bari and Maid-bar.
2.The composition of inclusions in swords and gums are much different It means that the different materials were used for these two lands of weapons.
3.We reenacted the historical forging way to control the carbon contents in iron materials, oroshi, and determined that both the carburization and decarburization is relatively easy by this traditional technique. (Special thanks to sword smith, Hokke Sabaro Nobufusa and Eiki)
4.The material of western guns imported to Japan at the end of Yedo Period are different from Japanese ones. They used material iron smelted with blast furnace.
5.We mold the shape of the threads of male and female screws at the end of gun barrels. The pitch, length, thread profile, thread angle and thread bight were measured with computer images.
6.We measured the speed of round bullet fired from three matchlock guns, which were made m Yedo Period, with different bore size. The condition of firing, especially the quantities of black powder was varied It was found that barrel length would influence to the kinetic energy of fired bullet.
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