声能:通过由薄橡胶膜形成的透镜折射声音,并填充碳酸。1925年的匿名插图。私人收藏。(Sound energy: refraction of sound by means of a lens formed by a thin rubber membrane and filled with carbonic acid. Anonymous illustration from 1925. Private collection.)匿名匿名 |
€ 98.15
Enthält 0% MwSt.
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日期不详 · Engraving
· 图片ID: 929426
Private Collection / Bridgeman Images |
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