藤原效應
Tetsuzan Nagata was born on 14 January 1884 in Suwa, Nagano Prefecture, the third son of Shigeru Nagata, director of the local Takashima Hospital. Nagata's family were wealthy and he descended from a long line of physicians in service of the Suwa Domain. Nagata was childhood friends with Shigeo Iwanami, the founder of Iwanami Shoten, and the two had a lifelong friendship. Nagata attended Suwa Higher Elementary School in Suwa where he was classmates with Sakuhei Fujiwhara, the namesake of the Fujiwhara effect. In 1895, Nagata transferred to an elementary school in Tokyo until 1898 when he began attending the military school of the Imperial Japanese Army in the city.