Author Topic: The Swedish model Norwegian design  (Read 5967 times)

Offline dsk

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The Swedish model Norwegian design
« on: August 13, 2013, 02:13:51 PM »
NB: This thread and the thread: : Norwegian: Elektrisk Bureau 1932-1953 Phones Bakelite versions. http://tinyurl.com/mk4ypt9  are related.
The Swedish model  Norwegian design
This 1920 to 195x made one piece bakelite phone was made with more than this diagram.
This Diagram was the std version made by Ericsson and Elektrisk Bureau of Norway (with different color codes)

dsk

PS
Added picture of the special version used in Trondheim, The handset are probably from another telephone.
DS
« Last Edit: May 10, 2015, 05:43:05 AM by dsk »
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Offline dsk

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Re: The Swedish model Norwegian design
« Reply #1 on: October 19, 2013, 04:20:21 PM »
I have a rather rare dial from this kind of phone, The type dial has never worked properly.
dsk
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Offline rdelius

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Re: The Swedish model Norwegian design
« Reply #2 on: October 19, 2013, 06:13:43 PM »
The Ericssion dials of that type you can loosen the main gear and advance or retard where the break contacts rest between the gaps in the impulse gear.

Offline dsk

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Re: The Swedish model Norwegian design
« Reply #3 on: November 14, 2013, 11:06:27 AM »
Here are 3 alternative diagrams used in Norway inside the same bakelite housing.
They are quite rare, but The Trondheim version may be seen frome time to time, the other 2 ???
I have never seen them.

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Offline Jack Ryan

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Re: The Swedish model Norwegian design
« Reply #4 on: November 14, 2013, 07:40:15 PM »
Dsk,
As Rdelius mentioned, the pulse cam on your dial rests in the wrong place.

As you probably know, at rest, the pulse contacts should be open. When you begin to dial, the pulse cam moves backwards just enough for the pulse contacts to close. When you release the dial, the pulse cam moves forward to begin the first break and then continues pulsing until it reaches the stop.

If the bursts of AC in your timing diagram indicate a break, it seems that the first break is not only short, it is not completely open (the AC signal is attenuated). Can you adjust the position of the pulse cam and then check for correct operation and cleanliness of the pulse contacts?

Does the off normal contact operate correctly?
What are the details of the dial tester you are using?

Thanks
Jack

Offline Jack Ryan

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Re: The Swedish model Norwegian design
« Reply #5 on: November 14, 2013, 07:42:11 PM »
Dsk,

Does Fig 28 on the circuit page you posted show a BTMC dial?

Thanks
Jack

Offline dsk

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Re: The Swedish model Norwegian design
« Reply #6 on: November 15, 2013, 05:59:55 AM »
The dial in this thread is made by Elektrisk Bureau, Norway, The dials was causing so many problems so E.B. abandoned the production for years, and bought dials from STK (=STC or BTMC)

It is not possible to adjust the timing, and rest positions for the contacts.
The pulse contact had to remain closed in rest position, the other contact was normally open, and closed when moving the dial out of rest position.

dsk
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Offline dsk

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Re: The Swedish model Norwegian design
« Reply #7 on: March 21, 2014, 05:59:01 AM »
Spanish version seems equal:

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Offline Matilo Telephones

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Re: The Swedish model Norwegian design
« Reply #8 on: March 21, 2014, 08:05:56 AM »
Similar to the ones I see in Holland, but with one exception. I have never seen a dial like that with 3 wires. Only 4 or 5.
Groeten,

Arwin

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Offline dsk

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Re: The Swedish model Norwegian design
« Reply #9 on: May 10, 2015, 05:23:04 AM »
Slightly different wiring on the Norwegian Elektrisk Bureau Chematics:

dsk
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Offline dsk

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Re: The Swedish model Norwegian design
« Reply #10 on: May 11, 2015, 04:35:42 AM »
Big problems uploading pictures, but here is another version of the 3 wire dial:
I hope I will be avble to uplod these direct to the forum, now I have made up an Google account for this.   :-[
dsk
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Offline rdelius

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Re: The Swedish model Norwegian design
« Reply #11 on: May 11, 2015, 09:44:26 AM »
It looks like SC might  have copied elements of this design for their dials

Offline dsk

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Re: The Swedish model Norwegian design
« Reply #12 on: May 12, 2015, 12:23:20 PM »
Trying to post pictures re-sized to max length/with (the greatest side) to 1000PX 45 PX/inch

dsk
« Last Edit: May 12, 2015, 12:24:52 PM by dsk »
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unbeldi

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Re: The Swedish model Norwegian design
« Reply #13 on: May 12, 2015, 01:14:55 PM »
I think the diagram shows that the dial is actually not that unusual, despite having only a three-wire dial cord.

If the diagram matches the phone, the dial itself actually has five contacts, two for the dial pulse, and three for a break-make switch.  It just has two jumpers across some contacts, and it is the specific application or wiring in the instrument that only requires three wires. I only uses the off-normal make contact to shunt the entire phone during dialing, which is what the first dials by Western Electric did too, before the 50AL desk stand with the No. 2 dial.
« Last Edit: May 12, 2015, 01:22:58 PM by unbeldi »

Offline dsk

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Re: The Swedish model Norwegian design
« Reply #14 on: May 12, 2015, 04:46:13 PM »
The 2 dials over are different in the way they make the breaks. The upper has a cam with 10 teeth. the other has a geared moving contact breaker with 2 or 3 breaks pr revolution.

dsk
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