When Leonard Hayflick began his cell culture work at the Wistar Institute in the 1950s, the field was facing a nagging problem. Culture flasks were so big, that microscope objective lenses couldn't come reasonably close to the subject. Hayflick told his Leitz sales representative about the problem, and the sales rep returned with an inverted chemist's microscope popular among crystallographers. With slight modification, it became a workhorse for cell culture work.
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Leitz Inverted Microscope, Circa 1958
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