| 单词 | polyzonal lens |
| 释义 | > as lemmaspolyzonal lens polyzonal lens n. now historical = Fresnel lens at Fresnel n. 1. ΚΠ 1823*Polyzonal lens [see main sense]. c1865 J. Wylde Circle of Sci. I. 258/2 A polyzonal lens, such as was employed..at the South Foreland lighthouse. 2004 Oxf. Dict. National Biogr. (Electronic text) at Brewster, Sir David The invention which he claimed and defended for most of his life was a type of zonal lens built up from annular rings and described as his polyzonal lens, which is now called a Fresnel lens. < as lemmas |
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