GEORG HARTMANN

'Georg Hartmann' (sometimes spelled 'Hartman'; 1489, Eggolsheim near Forchheim, Bavaria - April 9 1564, Nuremberg) was a German engineer, instrument maker, author, printer, humanist, churchman, and astronomer.
At the age of 17, he began studying theology and mathematics at the University of Cologne. After finishing his studies, he travelled through Italy and finally settled in Nuremberg in 1518. There he constructed astrolabes, globes, sundials, quadrants (an instrument similar to the sextant) and other instruments. Hartmann was possibly the first to discover the inclination of Earth's magnetic field
His two published works were ''Perspectiva Communis'' (Nuremberg, 1542), a reprint of John Peckham's 1292 book on optics and ''Directorium'' (Nuremberg, 1554), a book on astrology. He also left ''Collectanea mathematica praeprimis gnomonicam spectania,'' 151 f. MS Vienna, Österreichische Nationalbibliothek, Quarto, Saec. 16 (1527-1528), an unpublished work on sundials and astrolabes that was translated by John Lamprey and published under the title of ''Hartmann's Practika'' in 2002.
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References

1. MG Kivelson, CT Russell (1995), ''Introduction to Space Physics'', Cambridge University Press, ISBN 0-521-45714-9; p. 3-5
2. ART Jonkers (2004), ''Erdmagnetismus zur Zeit der Seefahrer'', PHYSIK JOURNAL, 2004, p. 55-59; fulltext
3. John Lamprey (2002), ''Hartmann's Practika'' 'Making Sundials and Astrolabes by Compass and Rule', ISBN 1-931947-00-7 lamprey@frii.com
4. John P. Lamprey, ''An Examination of Two Groups of Georg Hartmann Sixteenth-century Astrolabes and the Tables Used in their Manufacture,'' ANNALS OF SCIENCE, 54, (1997), 111-142. 138.
5. H. G. Klemm, ''Georg Hartmann aus Eggolsheim (1489-1564): Leben und Werk eines fräkischen Mathematiker und Ingenieurs'' (Wissenschaftliche und künsterlische Beiträge, Ehrenburg-Gymnasium Forscheim, Heft 8), (Forscheim, 1990).
6. Hans Gunther Klemm, ''Magnetismus-Beobachtungen Bei Den Humanistischen Mathematikern Georg Hartmann und Georg Joachim Rheticus,'' (Erlangen, 1994).