Needed: Post Phone Dial Wheel?

[DavePEI]

Do any of our European friends recognize this GPO? phone? The only Visible markings are Post on both the phone and the connection black.
It needs a dial wheel... Anyone have a spare?

[unbeldi]

Looks like it is a copy of a design by T&N in Germany for what they call a "middle-station switch" for a small private station system.

[DavePEI]

Looks like it is a copy of a design by T&N in Germany for what they call a "middle-station switch" for a small private station system.

I agree that it looks to be German design, but does bear the POST logo on both the connection box and the underside of the phone. There are some other markings, but they are worn to the point where they are unreadable... Interesting phone, though...

[unbeldi]

The German Post used a system officially labeled "W33", that uses sets very similarly looking station sets, but it was made by many manufacturers, notably Siemens & Halske originally.
Other companies, such as BTMC, may well have copied the concept for export.  Notice that the top housing for the dial and handset cradle detaches just like some of the 27xx systems, or like the W28 by Siemens and others.

Typically, a small number of these sets were used in conjunction with one control station that provided access to central office lines.  This control station occupied the "middle" between central office and private stations, and therefore was called a "Zwischenstelle" ("between station" or middle station).

[dsk]

Is it this one: http://tinyurl.com/h63zkjx   ??

dsk

[DavePEI]

Very similar, but it hasn't got the switch above the buttons and a different style of button. I did find another similar one at: http://telefoniemuseum.nl/English/Old%20telephones.htm

labelled: Siemens 5/1 metal table phone for 1 exchange line and 5 telephones the same as the one you showed... It does, look, however, like it uses a Siemens and Halske type dial wheel.

[rdelius]

The fingerwheel of a HEEMAF set should fit.Common dial fingerwheel on older German sets and copies. There is a German site with parts for sale

[DavePEI]

Looking at some German Siemens dial photos, and considering the position of the 9 and 0 on the dial, it looks as though perhaps I should be looking for a W38 or Model 36 dial wheel?

[rdelius]

W-48 will fit or Dutch Heemaf

[DavePEI]

More details and photos:

Here are some more details about the German phone mentioned below. The phone was made by Hagenuk, DE in 1957. The first two photos are of its Bell/Connection box (the first one showing the Hagenuk paper inside), the next one, the rear of the phone, then a photo of the backside of the dial (the one I need a fingerwheel for), and the final one, of the inside of the phone....

[Matilo Telephones]

Sorry for the belated reply. I am on vacation at the moment.

If I understand correctly the Zwischenstation telephones were an intermediate to the automatic public telephone network and a private network of non-automatic telephones, a bit like an intercom system.

The ones I have seen have some kind of selector button to choose between the outside or the internal line. After selecting the internal line you can select a button for the extention you want. There is a button for each one. These buttons typically make contact for a short interval. When the button is released the contact is broken. A system of relays makes the connection.

Daves phone is a little different. It has switches for eacht other phone in the network. They remain depressed untill the handset is replaced on the cradle. It comes with a large connection box and is connected to a number of these same telephones, without an intermediate switching system.

The ATEA 600 is another example of this type of telephone.

I do not know the exact type of Dave's telephone. I have similer ones in my possession though.

About the dial, it is a so called NrS 38. Designed by Siemens & Halske, made by many different makers in lots of countries.

This particular one, as Remco spotted and pointed out on Facebook, has the Dutch wiring colours and is stamped CWP, the repair department of the Dutch PTT. So it is probably a replacement.

I do not have a spare fingerwheel, I am afraid. I have a lot of dial mechanisms with damaged fingerwheels and need some myself.

But fortunately there is a company selling new ones.

http://www.telefonmanufaktur.de/shop/product_info.php?cPath=25&products_id=105&osCsid=iq1f5g4nvk5t3998h5ubtfho57

Please mind if you order one, that they charge you for parcel shipping. You need to mail them that you want letterbox shipment. Shipping is much cheaper that way.

I have bought a few myself and they are real bakelite and fit quite well.
THey also sell the retaining bolt with the hexagonal bakelite front.

[unbeldi]

Thanks for the additional pictures.

Arwin is correct that this is not a Zwischenstation.

I am now certain that this is the Hagenuk Mithörapparat No. 841.

Mithörapparat means something like "Listen-in apparatus". It was used to literally listen in on  telephone calls in private enterprise telephone systems for "quality control, teaching, training, and practicing customer interactions, etc...

Zwischenstations also performed this function very often, by simply having an extra key to enable the feature, but this is a specialty set for just that purpose.

Hagenuk built this particular set in two varieties, a five-line version and a ten-line version.  Yours is obviously for five lines.

I have also located the circuit diagrams for your set in my library, which are attached.

From the image you can see that a complete system also requires the connection box (Beikasten) in the second picture.

I believe that the earlier edition of this system was designated W30 by the Reichspost. Many of these systems were issued with newer telsets over time.

Image source:  Circuits for specialty station equipment of the German Bundespost, Printed L.C. Wittich, (1953).

[DavePEI]

Thank you so much! That was above and beyond the call of duty! Thank you,l Thank you! Thank you!

[unbeldi]

Most welcome...
Glad it worked out this way...  It may actually be feasible to put this set to use for demonstration since it doesn't require some of the elaborate relay boxes and wiring schemes of other multiple telset systems.  The missing connection box can probably by substituted with punch down blocks.

It does require 24 VDC for the lamps, though.

[DavePEI]

Oh, I do have the connection box. See the label from it and the photo below that....