Zacharias_Janssen Zacharias_Janssen

Zacharias Janssen - Definition and Overview

Zacharias Janssen (1580-1638) (flourished c. late 16th century) was a Dutch spectacle-maker, son of Hans Janssen. He is claimed to have been the first to invent a compound microscope, probably with the help of his father in the year 1595, although the origin of the microscope is a matter of debate.

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