I'm currently digging into early telephone installations and there were quite different approaches to the challenges that had to be dealt with, depending on pre-existing infrastructure, but also massive differences per country: adoption rate, government involvement, postal regulations, safety questions and all that.

You all know the tower of the Stockholm Telephone Exchange, probably? Yeah, those are A LOT OF PORCELAIN INSULATORS

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Post, Telegraaf en Telefoon or actually, in the Netherlands, Staatsbedrijf der Postereijen, Telegrafie en Telefonie (PTT).

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AEG 1907

#poster_thursday

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Not specifically French, also not 100 years old, this is just a lil stash of NIB tubes of somewhat limited use.
Unless you're looking at using them to drive an amp with PL504s or some such!

At least it's not a Decal tube of the 200 series!

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✍️ The call for papers for the 8th International Workshop on the History of Speech Communication Research, which is being co-organised by the #PHONLAB team, closes on 15 May.

This year’s edition places particular emphasis on #ExperimentalPhonetics as an emerging field at the intersection of the humanities, medical sciences and engineering, which underwent rapid development throughout the 20th century.

ℹ️ https://ihc.fcsh.unl.pt/en/events/8th-iwhscr/

#IWHSCR #Histodons #CFP #Communication #Speech #HistoryOfTechnology

Logo of the RRG (Reichsrundfunk-Gesellschaft) in their founding year 1925. Some similarity with the later Lufthansa logo.

The RRG was instrumental in the Gleichschaltung, concentrating all the local broadcasting institutions under one national umbrella.

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This rare tube has ceased working.

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A few Bosch MP capacitors. The folding rule to the left is 10 cm long 😅

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A CGR catalog page of the late 70s I think. I only have three pages without any date on them.

Not certain what we are looking at, my guess is it's an image of a crystal or mineral.

<- https://oldbytes.space/@daily_tsf/116524685968911954

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Staying with La Science & La Vie of September 1925, here's the Superhet by the inventor of the superheterodyne principle, Lucien Lévy (founder of Radio-LL).

For about 80 years, this principle was the way to receive radio communication. Sure, some improvements and variations were made, but basically, this is it.

And as such things go, at least three people had similar ideas in 1917. Lévy was being dragged into patent lawsuits with Armstrong in the USA, but the score was finally settled when Armstrong got his patent in 1920 and the priority of Lévy was accepted.

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