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Steel record?

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I never heard of this format, so a brief web search found me this. From what I can ascertain, these were steel records with grooves, but no sound recorded on them, and you record on them by shouting into the phonograph horn. Based on the instructions below, I expect that fidelity was extremely low.

2-metal-5-78rpm-discs-kodisk-snapshots-of-your-voice-1922-metal-recording_46312016


2-metal-5-78rpm-discs-kodisk-snapshots-of-your-voice-1922-metal-recording_46311995
 
That really is a cool historical novelty. I don't know about "totally playable on any turntable" though. Also, that disc in the picture from the CL ad looks to be badly off-center.
 
I have a couple of aluminum ones that must have come along later - like the 40s.

Also have one recorded by my dad in 1947 when he was in broadcast journalism class. It's shiny black plastic of some sort, but it has a small chip out of the edge, and you can see that it has a metal core under the plastic. It's a Recordiodisc.

Never heard of a steel-only one.
 
I would want the seller to demonstrate playability on his/her turntable. It might sound tinny...
 
toxcrusadr said:
Also have one recorded by my dad in 1947 when he was in broadcast journalism class. It's shiny black plastic of some sort, but it has a small chip out of the edge, and you can see that it has a metal core under the plastic. It's a Recordiodisc.
Click to expand...
That's a lacquer, some call it an acetate, but it's aluminum with lacquer poured on it and dried. In the mastering lab they send the signal to the record lathe and that stylus cuts the groves in the lacquer.
 
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