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Old 21st Sep 2021, 9:01 pm   #1
Gi4CZW Cliff
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Join Date: May 2011
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Default GPO telegraph sig & galvanometer

I have a galvanometer in very poor condition, which I would like to clean up. Internet gives it different names, " Differential Galvanometer ", " Cathedral signal indicator ", "Type 22a". This one has center zero with 60 to either side. Any experience on how to dismantle and how it was used, of interest.
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Old 22nd Sep 2021, 11:47 am   #2
Gridiron
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Default Re: GPO telegraph sig & galvanometer

Normally there is a thumbscrew on the back near the top. Remove it and the hood with the glass in it can be carefully tilted forwards, this is located by 2 pins on the base section.
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Old 23rd Sep 2021, 1:01 pm   #3
Gi4CZW Cliff
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Default Re: GPO telegraph sig & galvanometer

Hello Gridiron, thank you for reply and yes I had done that. So that is how I knew to ask for help. As the needle/pointer is stuck, the small screws really tight and the pivot, near pocket-watch delicate, I hesitate to proceed. In the past GPO telephones had engineering instruction for dismantling/calibrating such things, even with exploded views.
How the ( telegraph ? ) line was connected ( from underneath ? ) and it's intended use also of interest. many thanks . Cliff.
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