Stephen wrote:I surely would like to see those additional pictures, Albert. I need to find a copy of that book as well!
The other possibility is that they were using pre-grooved recording discs that did not require a lathe. They typically comprised soft aluminium discs with shallow grooves embossed in them. One could place a blunt embossing stylus in a standard reproducer head and add a weight to the head so that the embossing stylus would create a deep modulated groove when the reproducer head was attached to a recording amplifier output.
It looks to be a shellac gramophone record on the turntable.
Re photos..... will take some more and post soon.
Re the book...... Abe books lists four copies (some pricey up to $200). UK book world list two (still pricey!)
I have the 4th edition (1934).
Later editions begin to bring in CRT TV.
Probably eBay is the best place to watch.
There is a preface by Baird in which he concludes,"I see no insurmountable barrier in the way of the advancement of television to a perfection rivalling the cinematograph."
Albert.