Sound: l) Condensed and rarified wound waves: 2) Echoes: 4) Megaphone: 5) Ear trumpet: 6) Speaking tube: 7: The Ear: 10-20) Musical instruments From educational print published Wurtemberg c1850.

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Sound: l) Condensed and rarified wound waves: 2) Echoes: 4) Megaphone: 5) Ear trumpet: 6) Speaking tube: 7: The Ear: 10-20) Musical instruments From educational print published Wurtemberg c1850.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

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