He studied surveying, gunnery, Western studies, and Mechanical Engineering, etc., directed many disciples, and significantly contributed to modernization of Japan in the end of Edo period.
測量術、砲術、蘭学、機械工学などを学び、幕末の時代に多くの門弟を指導し、幕末における日本の近代化への貢献が大きかった。