| 单词 | light-beam oscillograph | 
| 释义 | light-beam oscillograph [`līt ´bēm ä`sil·ǝ´graf]  ELECTROMAGNETISM An oscillograph in which a beam of light, focused to a point by a lens, is reflected from a tiny mirror attached to the moving coil of a galvanometer onto a photographic film moving at constant speed.  | 
	
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