Coddington magnifier
nounEtymology
Popularized and refined by Henry Coddington.
Definitions
A magnifying glass consisting of a single thick lens with a central deep groove diaphragm…
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.
The neighborhood
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA