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--- On Sat, 10/10/09, Tom Fine <[log in to unmask]> wrote:

http://upload.wikimedia.org/wikipedia/commons/d/d8/Dictation_using_cylinder_phonograph.png

> I'm way out on thin ice with this so some of the Edison
> experts on this list might shoot this theory down!

That's a picture of a Bell/Tainter Graphophone, but as
for concept, yes, you're right.  The "hearing tubes" were
constructed in several styles, but they basically
resembled a doctor's stethoscope.