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British telephone power plant #164370 06/01/07 11:59 AM
Joined: Aug 2001
Posts: 7,520
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pauluk Offline OP
Member
These pictures are scanned from the 1950 edition of Atkinson's Telephony, a two-volume set which was considered the "bible" of the British telephone system for many years, and is still one of the best overall references for the old SxS days of the U.K. telephone network.

[Linked Image]

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[Linked Image]

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[Linked Image]

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[Linked Image]

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More to follow later.....



Tools for Electricians:
Re: British telephone power plant [Re: pauluk] #164371 06/01/07 12:27 PM
Joined: Oct 2006
Posts: 745
E
EV607797 Offline
Member
Paul: Isn't it unbelievable how far technology has come in just 50 years or so? Can you imagine with today's cost of real estate how much all of that space would cost now? I also wonder if back in those days when everybody smoked if they did it in those battery rooms!

Thanks for the pics.


---Ed---

"But the guy at Home Depot said it would work."
Re: British telephone power plant [Re: EV607797] #164516 06/04/07 11:01 PM
Joined: Mar 2005
Posts: 1,803
Alan Belson Offline
Member
Well, the gentleman in the fourth pic appears to be smoking! BTW, the battery casings appear to be wood with dovetailed corners.

What is the 'Pilot' battery in pic 4 Paul?


Wood work but can't!
Re: British telephone power plant [Re: Alan Belson] #164520 06/05/07 04:59 AM
Joined: Dec 2005
Posts: 860
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RODALCO Offline
Member
Great photo's !
Well made good quality equipment.
An enjoyment to see, instead of all the non repairable cheap nasty plastic c%#p we see all too often.

Thanks for posting these
Regards, Raymond


The product of rotation, excitation and flux produces electricty.
Re: British telephone power plant [Re: EV607797] #164709 06/09/07 06:05 AM
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pauluk Offline OP
Member
Quote
Can you imagine with today's cost of real estate how much all of that space would cost now?


There's a substantial amount of empty space in a lot of C.O. buildings now. Look inside even something as recent as a 1970s building which originally housed a TXE2 * and now that they're just housing a digital remote concentrator unit there's a lot of empty space in the main apparatus room.

* TXE2 = Telephone eXchange Electronic No. 2, something like the American #1 ESS in overall design.

Quote
BTW, the battery casings appear to be wood with dovetailed corners.


They are! Click here for a page which describes some of the different cell construction methods.

Quote
What is the 'Pilot' battery in pic 4 Paul?


Most likely a separate battery supply for the pilot indicators used to signal various calling and alarm conditions in the building. For example, on night service the manual board might have been switched so that incoming calls not only illuminate the calling lamp over the jack itself, but also sound a buzzer and/or illuminate a master pilot lamp at the end of the suite to draw attention.

This battery bank would have been an older installation even in 1950. Some of the earlier manual exchanges used 22 or 40V, and quite a number would have still been in service at that time. 50V became the norm in later years, and of course for automatic switching.

Re: British telephone power plant [Re: pauluk] #164779 06/11/07 06:48 AM
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pauluk Offline OP
Member
Some more scans:

[Linked Image]

Larger image




[Linked Image]

These pages explain the operation of the drum-switch regulator. The second link includes the full-size photo and control-circuit schematic:

Drum switch regulator, 1

Drum switch regulator, 2

Drum switch regulator, 3


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