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Topic Title: Old meter - anyone any ideas?
Topic Summary: GPO 2847
Created On: 24 February 2014 08:04 PM
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 24 February 2014 08:04 PM
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Avatar for stateit.
stateit

Posts: 2227
Joined: 15 April 2005

One of my stepdad's, found while clearing things out.

Never knew he had it when he was still around, or I'd have asked him about it!

Haven't got much clue about it: GPO 2847. +/-70 on the dial. Presumably volts.

Beautifully crafted bit of kit. I've not cleaned it up yet. but it will.

He was trained to 10th Edition, BTW.

I've had his AVO 8 MkIII for a while, working, with original leads.

Anyone got specific details on it? Google hasn't been my friend.

Pics are linked below:

Pic 1

Pic 2

Pic 3

Pic 4


Enjoy!

-------------------------
S George
http://www.sg-electrical.com
 24 February 2014 08:56 PM
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anastasis

Posts: 588
Joined: 01 September 2009

It's a type of galvanometer - the scale is deflection in degrees (I think)

Very similar to this: http://www.museumoftechnology.org.uk/expand.php?key=423

Also see: http://www.museumoftechnology....hy.php?cab=teleg_galvo

And: http://www.cntr.salford.ac.uk/comms/telegraphy.php (Edison and Swan near the bottom)

Edited: 24 February 2014 at 09:10 PM by anastasis
 24 February 2014 10:14 PM
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intrinsic4225B

Posts: 1626
Joined: 30 September 2004

It looks like it could be an ancestor of the GPO Detector No.4 that was once a common test instrument - effectively a galvanometer for use with external (and maybe some internal) multipliers and shunts and a forerunner of the modern multimeter.
 24 February 2014 10:53 PM
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stateit

Posts: 2227
Joined: 15 April 2005

Thanks to you both for the information.

Intriguing.

Also have one of these, box a bit tattier than in the link below

Avo Minor

Manual for AVO Minor

Only 3" x 4" x 1 3/4 ". A Minor Marvel indeed.

I imagine after I've had a careful play with them I'll put them the way of Seaford Museum - a wonderful place with an absolutely amazing collection of vintage radios, TVs, and other household electronic goods.

A different style of surprise I found in the clearout I had was a brand spanking new shiny, boxed Dorman Smith Loadmaster Series 15 6A MCB.

I've a customer's Series 15 DB that's going in

-------------------------
S George
http://www.sg-electrical.com
 24 February 2014 11:03 PM
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intrinsic4225B

Posts: 1626
Joined: 30 September 2004

Stateit,

What are the markings by the terminals on the top of the instrument?

I can see the switch at the front right is marked 'shunt' and 'full coil' but what are the markings by the terminals to the rear?

Edited: 24 February 2014 at 11:10 PM by intrinsic4225B
 24 February 2014 11:09 PM
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anastasis

Posts: 588
Joined: 01 September 2009

Ross,

Permit me to answer.

If you look at the text at: http://www.museumoftechnology....uk/expand.php?key=423

Someone says the coils are known as "quantity" and "intensity".

You'll be able to work out the markings from that...
 25 February 2014 09:23 AM
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stateit

Posts: 2227
Joined: 15 April 2005

Hi Intrinsic,

As anastatsis has said: QNT and INT for Quantity & Intensity

'1/5 SHUNT' and 'FULL COIL' at the switch.

-------------------------
S George
http://www.sg-electrical.com
 25 February 2014 09:01 PM
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ArthurHall

Posts: 737
Joined: 25 July 2008

Re your AVO8 did you know the last three or four digits of the serial no give the month and year it was made; ie 667 june 67 or 1263 dec 63. I am not sure if its the same for the AVO minor.
Statistics

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