Which scientific instrument was invented by father and son Hans and Zacharias Jansen in the late 16th Century?
Zacharias Janssen the microscope as early as 1590 and that Hans Lippershey had stolen his father's invention of the telescope. This testimony seemed to convincing to Boreel, who modified his recollections, concluding that Zacharias must have been who he remembered. Boreel's conclusion that Zacharias Janssen invented the telescope a little ahead of spectacle maker Hans Lippershey was adopted by Pierre Borel in his 1656 book on the subject. In Boreel's investigation Johannes also claimed his father, Zacharias Jansen, invented the compound microscope in 1590. This pushes the date so early it is sometimes assumed, for the claim to be true (Zacharias most
Hans Jansen Hans Jansen Johannes Juliaan Gijsbert "Hans" Jansen (; 17 November 1942 – 5 May 2015) was a Dutch politician, scholar of contemporary Islam and author. Hans Jansen belongs to the "revisionists" in Islamic Studies, i.e. he fundamentally doubts the historicity of the Islamic traditions on early Islam which were written only 150 to 200 years after Muhammad. Moreover, Jansen doubts the existence of Muhammad as a historical person. Hans Jansen's parents were strict Calvinists. At the age of 17, Jansen began studying theology at the University of Amsterdam, yet changed the subject after one year to Arabic and Semitic languages.