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Old 22nd Sep 2021, 12:47 pm   #2
Gridiron
Heptode
 
Join Date: Apr 2010
Location: West Midlands, UK.
Posts: 659
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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