James Hann (1799–1856) was an English mathematician, teacher and textbook writer.
Hann then became a teacher, and kept a school at Friar's Goose, near Newcastle. An acquaintanceship with Wesley S. B. Woolhouse the mathematician led to Hann's obtaining a situation as calculator in the Nautical Almanac Office. A few years later he was appointed writing-master, and then shortly mathematical master at King's College School, London; this post he held till his death. Among his pupils was Henry Fawcett.
Hann was elected a member of the Institution of Civil Engineers in 1843, and was an honorary member of the Philosophical Society of Newcastle-on-Tyne. He died in King's College Hospital 17 August 1856, aged 57 years.
In 1841, with Olinthus Gregory, Hann drew up and published Tables for the Use of Nautical Men. He also contributed papers to the Diaries and other mathematical periodicals.
Hann published on mechanics and pure mathematics, works in these areas being for Weale's Rudimentary Series:
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