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French Eurieult Type 10

Started by countryman, December 05, 2022, 07:28:08 AM

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Thanks for the reminder. I found it on ebay Kleinanzeigen (classified ads portal, no longer owned by ebay, but still using the name) for 120 Euro (127 $ US).


Quote from: countryman on December 10, 2022, 04:34:55 PMThe use of the name Ivorine seems to be ambivalent ...

I now stumbled over another early thermosetting pressed compound, called "Ambroin" (for an early socket and plug for LB phones before 1910).
A quick research even found a company "Ambroin-Werke, Berlin-Pankow" - never heard before.
A 1927 book then complains about a multitude of names for synthetic compounds appearing and disappearing on the market for electrical insulators. The book explicitly mentions Bakelite as laudable exception! A lot of innovation and testing new products happened around 1900, and Bakelite was one thing that made the race. Many others names have been forgotten and were never standardized but used in a confusing way. Apparently that is also the case for "Ivorine".

Ambroin at least is defined in the book: It was made from Copal and Asbestos. Copal is a natural polymer, related to Amber, but more easily available. Asbestos is... umm... scary  :o, while bonded in a resin hopefully not an actual hazard.

Book: Gummifreie Isolierstoffe...


I just had a nice conversation with Bernard Chenot from (Musée du Téléphone de Narbonne in France). He was able to lift the "Ivorine" secret for me: The name describes a compound made from gutta-percha, marble powder and sometimes cement. It was also used for other phone bases, like the Berthon Ader 1892: (scroll down a little in the link).
Thanks to Bernard!