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| 1609 || Technological development || Italian scientist {{w|Galileo Galilei}} develops a compound microscope, with a convex and a concave lenses both fitting into a tube.<ref name="BiologyBiology">{{cite book |last1=Solomon |first1=Joan |last2=O'Brien |first2=Pat |title=Biology |url=https://books.google.com.ar/books?id=StPGGLN_vHgC&pg=PA5&dq=1609+Galileo+Galilei+a+compound+microscope&hl=en&sa=X&ved=0ahUKEwjf7MTvpYrgAhVVIrkGHfUmCqoQ6AEIKTAA#v=onepage&q=1609%20Galileo%20Galilei%20a%20compound%20microscope&f=false}}</ref><ref name="History of Microscopes"/><ref>{{cite book |last1=Smolyaninov |first1=Igor I |title=Hyperbolic Metamaterials |url=https://books.google.com.ar/books?id=zD9iDwAAQBAJ&pg=SA2-PA1&dq=1609+Galileo+Galilei+a+compound+microscope&hl=en&sa=X&ved=0ahUKEwjf7MTvpYrgAhVVIrkGHfUmCqoQ6AEIOjAD#v=onepage&q=1609%20Galileo%20Galilei%20a%20compound%20microscope&f=false}}</ref> || {{w|Italy}}
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| 1619 || Technological development || Earliest recorded description of a Dutch inventor {{w|compound microscopeCornelius Drebbel}} by Dutch inventor presents in {{w|Cornelius DrebbelLondon}}, presented in the earliest recorded description of a {{w|Londoncompound microscope}}. The instrument ia about eighteen inches long, two inches in diameter, and supported on 3 brass dolphins.<ref>Jerome Ch'en, {{w|Nicholas Tarling}}, Studies in the Social History of China and South-East Asia: Essays in Memory of Victor Purcell, Cambridge University Press, Jun 10, 2010, page 215</ref><ref name="The Origins of the Telescope">{{cite book|author1=Albert Van Helden|author2=Sven Dupré|author3=Rob van Gent|title=The Origins of the Telescope|url=https://books.google.com/books?id=XguxYlYd-9EC&pg=PA24|year=2010|publisher=Amsterdam University Press|isbn=978-90-6984-615-6|page=24}}</ref><ref>{{Cite book|url=https://books.google.com/books?id=kCSdiZcsWNsC&pg=PA5&dq=%22Cornelis+Drebbel%22+microscope#PPP1,M1 |title=The Microscope – Its Design, Construction and Applications by F. S. Spiers |publisher=Books.google.be |date= 2008-11-30|accessdate=2010-08-06|isbn=978-1-4437-2594-1}}</ref> ||
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| 1624 || Technological development || A {{w|compound microscope}} is exhibited in {{w|Rome}}.<ref name="Raymond J. Seeger 2016, page 24">Raymond J. Seeger, Men of Physics: Galileo Galilei, His Life and His Works, Elsevier - 2016, page 24</ref><ref name="J. William Rosenthal 1996, page 391">J. William Rosenthal, Spectacles and Other Vision Aids: A History and Guide to Collecting, Norman Publishing, 1996, page 391</ref> || {{w|Italy}}
