Timeline of microscope technology
Timeline of microscope technology c. 700 BC: The "Nimrud lens" of Assyrian manufacture, a rock crystal disk with a convex shape believed to be a burning or magnifying lens. 13th century: The increase in use of lenses in eyeglasses probably led to the wide spread use of simple microscopes (single lens magnifying glasses) with limited magnification. 1590: earliest date of a claimed Hans Martens/Zacharias Janssen invention of the compound microscope (claim made in 1655). After 1609: Galileo Galilei is described as being able to close focus his telescope to view small objects close up and/or looking through the wrong end in reverse to magnify small objects. A telescope used in this fashion is the same as a compound microscope but historians debate whether Galileo was magnifying small objects or viewing nearby objects with his terrestrial telescope (convex objective/concave eyepiece) reversed. 1619: Earliest recorded description of a compound microscope, Dutch Ambassador Willem Boreel sees...
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