In 1931, electromagnetic lenses helped scientists see a world ordinary microscopes could not reach

In 1931, physicists Knoll and Ruska unveiled the first electron microscope, revolutionizing science by using magnetic lenses ...
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The invisible world : early modern philosophy and the invention of the microscope / Catherine Wilson

https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!472505~!0#focus ...