Did your mica diaphragm come from New Hampshire?

[CurtA]

Ruggles Mine in NH was the source for a lot of mica since 1805...

 

https://www.atlasobscura.com/articles/ruggles-mine-mica-auction

[PeterPoggi]

I'm still learning different aspects about these fascinating machines - Can you point to any resources that show how the mica was/is cut into circles for use in reproducers? 

[Analogous]

We're all still learning.  Always.