This is my first glass diaphragm, as I have Model C's on all of my Phonographs. I can't wait to hear the difference.edisonphonoworks wrote:I have used the new glass diaphragms in my 1890's recorder, and my automatic reproducer, and am very happy. I wish though that some thinner sizes a 6 and 5 thousandths would be nice, and even a 2 thousandths for violin, and acoustic guitar, in the 1890's size 5-9 were available for recording, in half thousandths increments. The glass works well in later recorders too.

Thanks for all the information! I'm fascinated with the Historical implications of the glass manufacturing. The French and British were ahead of the US in producing the high quality glass up to the first decade of the 20th century. Indeed, they were world leaders until the end of the 19th century.
In regards to your desire for thinner glass, I wonder if any small, local, optics manufacturers could grind some inexpensively?
Fran