Lydenergi: brydning af lyd ved hjælp af en linse dannet af en tynd gummimembran og fyldt med kulsyre. Anonym illustration fra 1925. Privat samling.(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.)Anonymous Anonymous |
| € 132.14
Inklusive 25% moms |
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1925 · Engraving
· Billed-ID: 929426
Private Collection / Bridgeman Images |
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