| 单词 | photometer head |
| 释义 | > as lemmasphotometer head photometer head n. the part of a photometer by means of which the comparison or measurement is effected. ΚΠ 1899 Proc. Royal Soc. 65 487 A device worked by an electric current from a key placed under the photometer head. 1973 W. Thomas SPSE Handbk. Photogr. Sci. & Engin. ii. 153 Photometer heads are used in conjunction with some means for varying the luminance of one or both surfaces in a known manner so that a photometric balance may be obtained. < as lemmas |
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