Author Topic: Norwegian "Telegrafverket" metal 1934 Oslo and rest of Norway Elektrisk Bureau  (Read 66 times)

Offline dsk

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Telegrafverket the Norwegian State-owned telco used officially only one model, but it was a great independency in the organization so this was more or less a paper rule.

The standard phone was a metal box where you could move the decal and the fork, turn the hook-switch and convert between wall and tabletop. this was a relatively expensive make several layers of lacquer made by Elektrisk Bureau (EB) but the dial and the transmitter capsule was made by the competitor Standard Telefon og Kabelfabrik (STK) The Norwegian STC later ITT Ericson had at time big ownership in EB.   

The telephone used by the Oslo Area was different, it was not convertible, and at that time about $2 cheaper. Oslo did also use a different circuitry, and of-course, Oslo had their reverse dial.

To compare both telephones are pictured.

The circuit diagram is for the big one, used outside Oslo.

dsk

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Offline dsk

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Both the main office, and the Oslo office did not trust the the new material Bakelite, and Oslo kept on their phones until thermoplastic came in 1953.
Actually the standard telephone model was pretty rare, and the more lo cost bakelite phone with the same schematics were used a lot.  Except from these the cities of Bergen, Trondheim and Stavanger had their own schematics bakelite telephones. The undependent telcos used many different solutions.
What about the Oslo diagram? It is actual equal to the Trondheim circuit: more about this here: The Swedish model  Norwegian design
If you look well at this, it is pretty similar to the Western Electric 302, but has different hook switch and uses the same capacitor for the ringer and the voice circuit.

dsk
« Last Edit: November 20, 2017, 03:28:19 PM by dsk »
Please notify me of dead links in my postings.

C*NET +1 999-3011


I have even got a regular New York number :-) 646 570 1796