A few years ago my team and I at @IngeniumCa reconstructed Alexander Graham Bell's macabre 1874 ear phonautograph. We're still trying to figure out what the original mouthpiece was made of. I just wrote a blog on it 👇 Any ideas? We'd love to hear them! ingeniumcanada.org/channel/articl…
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@CommTechCurator @IngeniumCa Could it be a rubber bulb (cutted) like this one ?
