| 单词 | field bar |
| 释义 | > as lemmasfield bar field bar n. Optics (now rare) = field stop n. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > instrument for distant vision > [noun] > telescope > border or limit of field field bar1772 1772 Philos. Trans. 1771 (Royal Soc.) 61 538 Let ENWS..represent the field-bar of the telescope, EW and NS two wires intersecting each other at right angles. 1874 Monthly Microsc. Jrnl. 12 115 When we contract the field-bar of the eye-piece, the ‘central area’ continues to have all the rays..that reached that central area before contraction. 1968 E. J. Hartung Astron. Objects for Southern Telescopes 147 I have only seen the faint companion by shielding the brilliant white primary with a field bar. < as lemmas |
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