News:

"The phone is a remarkably complex, simple device,
and very rarely ever needs repairs, once you fix them." - Dan/Panther

Main Menu

Norwegian "Telegrafverket" metal 1934 Oslo and rest of Norway Elektrisk Bureau

Started by dsk, November 20, 2017, 03:09:50 PM

Previous topic - Next topic

dsk

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


dsk

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

dsk

#2
Pictures from this thread: https://goo.gl/DKr6Bx

These are the Oslo version in use by the polce and newspapers in 1965




dsk

Opening the phone is easy with just a spring lock, the handset transmitter capsule may be a little more tricky.

In the capsule cover it is a small hole in the middle of the red x, press a needle in there to move a locking tab, and then unscrew the bakelite cover.

dsk


dsk

Here is a better picture of the Oslo version diagram: