1600s
-around 1590 -improvements to glass making -improvements in science of light rays
-microscopes proved that Harveys ideas were correct -helped prove Galens theories wrong
-first made by a Dutsch clockmaker who used it to discover micro organisms
1800s
-in 1800s even purer glass was being produced -scientists understood even more about optics
-1830, Joesph Lister invents a microscope that can magnify x1000 without distortion
-helped disprove even more old theories such as spontaneous generation
1900s
-electron microscope invented in 1931 -allowed even clearer images
-allowed French researchers to find sulphonamides in just two years
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