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Febson Indicator

Stan Tyrer wants to know more about a Febson Indicator.

Stan wrote:

I have recently bought a small brass tool named as a Febson test indicator. Despite extensive searching, I cannot find out what this tool was used for. Can you help?
Best wishes

Stan Tyrer

Andy Tuckwell found a photo of the instructions

and then noticed it in the 1935 Buck and Hickman catalogue, which confirmed its use:

Any more information, pictures or usage tips are welcome.

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