Kunitomo Ikkansai

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Kunitomo Kosunaki

Born	(1778-11-21)November 21, 1778 Kunitomo, Nagahama, Shiga
Died	December 26, 1840(1840-12-26)
Nationality	Tokugawa shogunate
Occupation	gunsmith, inventor

In this Japanese name, the family name is "Kunitomo".

Kunitomo Kosunaki (国友一貫斎, November 21, 1778 – December 26, 1840) was a Japanese gun manufacturer of the early 19th century, who, after having spent several months in Edo, where he could get accustomed with Dutch wares, built Japan's first reflective telescope in 1831. It was of the Gregorian type.

Kunitomo's telescope had a magnification of 60, and allowed him to make very detailed studies of sun spots and lunar topography. Four of his telescopes remain to this day.

Kunimoto also developed manufacturing methods for guns, and also created an air gun based on rangaku knowledge acquired from the Dutch in Dejima.

Other uses of the name

6100 Kunitomoikkansai, a main belt asteroid discovered in 1991, is named after Kunitomo Ikkansai.

Kunitomo’s reflecting telescope, 1831.
Observation of the moon by Kunitomo in 1836.
Air gun developed by Kunitomo, circa 1820–1830.
Air gun trigger mechanism.

Persondata
Name	Kunitomo Kosunaki
Alternative names
Short description	Gunsmith
Date of birth	November 21, 1778
Place of birth	Kunitomo, Nagahama, Shiga
Date of death	December 26, 1840
Place of death

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