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1590 Jansen – Compound Microscope Essay Preview: 1590 Jansen – Compound Microscope Report this essay 1590 Jansen invented the compound microscope1665 Robert Hook examined cork using microscope and used the term cellto describe its basic units.1650-1700 Antony van Leeuwenhoeckobserved nuclei in red blood cells of fish and unicellular organisms including bacteria(animalcules).1831-33 Robert Brown described nucleus.