POST OFFICE GALVANOMETER GPO 41, 1930's

Used for indication of signal direction ( Current ) in telegraphy systems also as a test instrument.

Your comments:

• These instruments were carried in a leather case with cover / lid and fixing strap, also made of leather.
  My instrument is marked EDISON 1916 and the case is marked R.STAFFORD 1916 at the top.
  
  .......... Thomas Kraemer, Cochem / Germany, 2nd of April 2016
  
  
• Also known as a linesmen detector or Q&I detector. They had two sensitivities the Quantity or Q coil of about.2 ohm and the Intensity or I coil of about 100 ohms. Generally used for testing for current on telegraph circuits or in conjunction with a battery for testing continuity.
  .......... Arthur Williams, Invercargill New Zealand Awarua Communications Museum, 26th of November 2011
  
  

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