Many of these were zinc.  There was a cheap attachment with a "yell into it" 
horn.  I've never recovered any intelligible audio from any of these.  They 
are c. 1920.

Steve Smolian

-----Original Message----- 
From: David Lewis
Sent: Tuesday, June 12, 2012 8:26 PM
To: [log in to unmask]
Subject: Re: [ARSCLIST] presumably very early pre-grooved disks

I had Echo discs like this. Don't expect sound, although as objects they
are still interesting. I once transferred my Echo discs
and magnified them a gazillion times and discovered that there *was* the
faint sound of the piano on them, but it wasn't intelligible.

I look forward to the day when someone finds a disc of this type that
yields intelligible audio.

Uncle Dave Lewis
Lebanon, OH

On Tue, Jun 12, 2012 at 7:24 PM, Art Shifrin <[log in to unmask]> wrote:

> Hi Gang,
> Today amongst my shelves I rediscovered a pair of 6" apparently non
> laminated metal disks.
> They're self-evidently intended for use on a acoustic phonograph.  There's
> one sleeve. The instructions on it state "...Sing into the sound box 
> loudly
> and distinctly; if possible, use a megaphone. When you have finished, play
> it over again and hear YOUR voice..."  They have two different pre-printed
> labels but their layout and color (royal blue background with gold
> lettering) are very similar.  One's "MARVEL VOICE".  The other's
> "REPEAT-A-VOICE". They are relatively heavy: seemingly heavier (for the
> diameter) than if they were of the`'typical' uncoated aluminum recording
> blank stock of greater size.
> If any of you have historical information that you can provide (i.e. years
> offered, etc.), then it'd be nice to learn more about them.
> I've not yet attempted to play them.
> Thanks,
> Art (Shiffy) Shifrin