Christopher Cock was a

London London is the capital and largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary down to the North Sea, and has been a majo ...

instrument maker of the 17th century, who supplied

microscope A microscope () is a laboratory instrument used to examine objects that are too small to be seen by the naked eye. Microscopy is the science of investigating small objects and structures using a microscope. Microscopic means being invisibl ...

s to

Robert Hooke Robert Hooke FRS (; 18 July 16353 March 1703) was an English polymath active as a scientist, natural philosopher and architect, who is credited to be one of two scientists to discover microorganisms in 1665 using a compound microscope that ...

. These microscopes were compound lens instruments, which suffered greatly from

spherical aberration In optics, spherical aberration (SA) is a type of optical aberration, aberration found in optical systems that have elements with spherical surfaces. Lens (optics), Lenses and curved mirrors are prime examples, because this shape is easier to man ...

Bibliography

*Chapman, Allan and Paul Kent (2005). ''Robert Hooke and the English Renaissance''. Leominster: Gracewing. *Inwood, Stephen (2003). '' The Forgotten Genius: The Biography Of Robert Hooke 1635-1703''. San Francisco: Mcadam/Cage. * 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

Year of birth missing Year of death missing English inventors {{England-engineer-stub