Franz Kessler

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Franz Kessler's diving harness

Franz Kessler (c. 1580–1650) was a portrait painter,[1] scholar, inventor and alchemist living in the Holy Roman Empire during the 16th and 17th centuries.

He wrote a number of books and pamphlets: a book on stoves,[2] on making sundials,[3] on using a "sector" or "proportional instrument" (a simple calculator),[4] and on using "Napier's bones"[5] (another calculator) – among other works.

Painting

In the 1620s and 1630s, he was a portrait painter in Cologne, Germany.[6]

Inventions

References

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