I can't give a definitive answer but I remember reading quite recently that they were hill and dale. I can't see Edison recording laterally because he was so into vertical cut and I can visuallize that a vertical cut system would be far more compact.
On Wed, 5/6/15, Lou Judson <[log in to unmask]> wrote:
Subject: [ARSCLIST] Talking dolls: hill and dale? - Re: [ARSCLIST] Playing Edison Diamond discs
To: [log in to unmask]
Date: Wednesday, May 6, 2015, 2:36 PM
I wonder if the talking
doll recordings were hill and dale or lateral grooves.
May 6, 2015, at 12:17 PM, Paul Stamler <[log in to unmask]>
> This is a
linguistic issue, more than anything else. In the last 20
years, the word "phase" has come to be used where
"polarity" would really be a more accurate
description, and that'd hoe the word's being used in
this context. A hill-and-dale (vertical) recording has the
signal impressed on the groove vertically (duh), and when
played back with a conventional stereo cartridge it will
deliver signals from the two channels that are of opposite
polarity. Combine the signals as-is and the desired material
(music) will cancel, leaving only noise. Reverse the
polarity of one channel, then combine them, and the desired
signal will remain while the noise (ideally) cancels.