Conrad Gesner was a Swiss naturalist and bibliographer. His five-volume Historiae animalium is considered the beginning of modern zoology, and the flowering plant genus Gesneria is named after him.
Born: March 26, 1516, Zürich
Died: December 13, 1565, Zürich
Education: University of Strasbourg, University of Bourges, University of Basel
Joseph Dixon (1799–1869) was an inventor, entrepreneur and the founder of what became the Dixon Ticonderoga Company, a well-known manufacturer of pencils in the United States.
The “lead” pencil (which contains no lead) was invented in 1564 when a huge graphite (black carbon) mine was discovered in Borrowdale, Cumbria, England.In 1795, the Nicholas Jacques Conte (a French officer in Napoleon’s army) patented the modern method of kiln-firing powdered graphite with clay to make graphite rods for pencils.
Conrad Gessner
conrad gessner
N. J. Conte, in 1795, successfully produced pencils
Pencil, a derivative of the Latin word pencillus for “little tail,” originally described a small..
pencil inverter-Conrad Gessner.
N. J. Conte, in 1795
Conrad Gesner was a Swiss naturalist and bibliographer. His five-volume Historiae animalium is considered the beginning of modern zoology, and the flowering plant genus Gesneria is named after him.
Born: March 26, 1516, Zürich
Died: December 13, 1565, Zürich
Education: University of Strasbourg, University of Bourges, University of Basel
Joseph Dixon (1799–1869) was an inventor, entrepreneur and the founder of what became the Dixon Ticonderoga Company, a well-known manufacturer of pencils in the United States.
sonali patnaik
The “lead” pencil (which contains no lead) was invented in 1564 when a huge graphite (black carbon) mine was discovered in Borrowdale, Cumbria, England.In 1795, the Nicholas Jacques Conte (a French officer in Napoleon’s army) patented the modern method of kiln-firing powdered graphite with clay to make graphite rods for pencils.