Coddington magnifier

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English

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English Wikipedia has an article on:
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Etymology

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Popularized and refined by Henry Coddington.

Noun

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Coddington magnifier (plural Coddington magnifiers)

  1. A magnifying glass consisting of a single thick lens with a central deep groove diaphragm at the equator, limiting the rays to those close to the axis and minimizing spherical aberration.
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