• 

  Personal Narrative of Travels to the Equinoctial Regions of the New ... - Alexander von Humboldt, Aimé Bonpland, Helen Maria Williams - Google Books

  https://www.google.de/books?id=nRRjAAAAMAAJ&pg=388

  Keine Beschreibung vorhanden.

• 

  Aspects of Nature

  http://www.avhumboldt.net/humboldt/publications/books/did/25/title/Aspects-of-Nature

  Download PDF and navigate through the paragraphs of Aspects of Nature

• 

  Cosmos: a sketch of a physical description of the universe

  http://www.avhumboldt.net/humboldt/publications/books/did/35/title/Cosmos-a-sketch-of-a-physical-description-of-the-universe

  Download PDF and navigate through the paragraphs of Cosmos: a sketch of a physical description of the universe

• 

  The Geography of the Heavens: And Class-book of Astronomy : Accompanied by a ... - Elijah Hinsdale Burritt, Hiram Mattison - Google Books

  http://books.google.de/books?id=J00AAAAAYAAJ

  Keine Beschreibung vorhanden.

• 

  Clock Time-Line

  http://wayback.archive.org/web/20120421092041/http://www.ahsoc.demon.co.uk/timeline-clk.html

  The Antiquarian Horological Society (AHS), is a learned Society dedicated to the study of antiquarian clocks, watches and other forms of timekeeping.

• 

  Online Compass Museum - Cardinals

  http://www.compassmuseum.com/diverstext/cardinals.htm

  Virtual compass museum - the cardinal points in different languages

• 

  Deutsche Biographie - Staden, Hans

  https://www.deutsche-biographie.de/gnd118798367.html#ndbcontent

  Deutsche Biographie

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