Johann Zahn

Johann Zahn ( Joanne tooth; * March 29, 1641 in Carlstadt, † June 27, 1707 ) was a German Prämonstratenserchorherr, philosopher, optician, inventor, mathematician and author of various works.

Life and work

His main area of ​​work was the optics including the astronomical observation. Tooth referred to himself as a pupil of the astronomer Franz Griendel of Ach from Nuremberg. He was a professor of mathematics at the University of Würzburg. He was also a canon in the Premonstratensian upper cell and from 1685 to his death in 1707, provost in the lower cell monastery.

Tooth is best known for his research in the field of optics. Developed by Johann Sturm 1676 SLR with right side up picture ( deflection ), he developed further by having different focal lengths he put a telescopic lens of two parts (convex and concave) one after the other, so that a larger image was created (Reflex Camera Obscura ). He also emphasized the exposure chamber to black to exclude reflections. Except for the closure system, the invention provides a prototype of a camera dar.

His work Specula physico - mathematico - historica notabilium was a summary of all the natural sciences. The book Oculus artificialis teledioptricus immersive telescopium was at that time the standard work in the field of optics. When in 1702 appeared the second edition, surprised his readers with comprehensive dental supplements that made ​​his book for every scholar and instrument maker indispensable. Tooth compendium begins with the theory of optics, then it goes to the optical instruments includes, in microscopes, telescopes, mirrors and lenses belong. Well said tooth on the difficult subject of choice of glass and glass grinding before it ended with descriptions of astronomical observations.

Writings

  • Specula physico - mathematico - historica notabilium in two parts ( I: 448 pages, II: 460 pp.), Norimbergae (Nürnberg ): Gnarl to 1696.
  • Oculus artificialis teledioptricus immersive telescopium, ex abditis rerum naturalium & artificialium principiis explicatum ac e ' triplici fundamento, physico seu naturali, mathematico dioptrico et machanicoo, seu practito stabilitum. [2 vol. ]. Würzburg: Quirinus Heyl ( 1685-86 ) - Other sources speak of the Year 1702

Pictures

Illustrations in Specula physico - mathematico - historica notabilium:

Seebischof

Satyr from the sea

Globe of Venus

Vegetables Lamb

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