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Kunitomo Ikkansai | |
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| Born | (1778-11-21)November 21, 1778 |
| Died | (1840-12-26)December 26, 1840 |
| Occupation(s) | gunsmith,inventor |
Kunitomo Ikkansai (国友 一貫斎; November 21, 1778 – December 26, 1840), real nameKunitomo Tōbee Yoshimasa (国友 藤兵衛 能當), was a Japanesegunsmith and inventor of the lateEdo period, who, after having spent several months inEdo, where he could get accustomed with Dutch wares, built Japan's firstreflective telescope in 1831. It was of theGregorian type and had amagnification of 60. He used it to make very detailed studies ofsun spots and lunar topography. Four of his telescopes remain to this day.
In the early 19th century, Kunitomo became an acquaintance of theShinto theologian andnativistHirata Atsutane, and was in regular contact with him.[1] Around this time, Kunitomo was involved in the development of firearm manufacturing methods. Circa 1820, he designed apneumatic rifle based on his studies ofEuropean air rifle technology conducted through theDutch trading post atDejima.
Plane drawings created by Ikkansai, connecting parts for a reflecting telescope. Nagahama City Citizen Collaboration Department, Historical Heritage Section, research into the Kunitomo Ikkansai family records. Subsidized by the Agency for Cultural Affairs.Documents of the Kunitomo Ikkansai familyReflecting telescope (owned by Nagahama Castle History Museum, Nagahama City)
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