Caption: "Microscope manufactured by Christopher Cock (17th century) of London for Robert Hooke (1635--1703). Hooke is believed to have used this microscope for the observations that formed the basis of his book Micrographia (1665)." (Slightly edited.)

The microscope suffered badly from spherical aberration.

Credit/Permission: Billings Microscope Collection, National Museum of Health and Medicine, Armed Forces Institute of Pathology, before or circa 2007 (uploaded to Wikimedia Commons by Alan Hawk, 2007) / Public domain.
Image link: Wikimedia Commons.
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