I checked out the Diamond Disk that has been the
subject of discussion and though to myself that I'd
seen something like that before. I dug out my bible
(first edition of Tinfoil to Stereo) and found a photo
on plate IX which shows a Diamond Disk equipped with a
"Loud Speaking Attachment". It is similar but not
exactly the same as the one on ebay. The ebay machine
shows a typical #11 cygnet horn and elbow used on the
Diamond Disk. The example in the book shows a Music
Master bell attached to a unique elbow which in turn
is attached to the machine. I don't know if the "Loud
Speaking Attachment" was ever offered to the public
but one machine was made. Does anyone know? Thanks,
Jerry B.
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