Christopher Cock was a London instrument maker of the 17th century, who supplied to Robert Hooke. These microscopes were compound lens instruments, which suffered greatly from spherical aberration.
Bibliography
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Chapman, Allan and Paul Kent (2005). Robert Hooke and the English Renaissance. Leominster: Gracewing.
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Inwood, Stephen (2003). The Forgotten Genius: The Biography of Robert Hooke 1635-1703. San Francisco: Mcadam/Cage.
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Helen Purtle, The Billings Microscope Collection of the Medical Museum, Armed Forces Institute of Pathology (Second Edition) Washington, DC: Armed Forces Institute of Pathology, 1974 (Reprinted 1987).[1]
