Mystery (to me) tool

[Democritus]

Does anybody know what a Febson patented test indicator was (is) used for.?
D.

 

[TheUnicorn]

 

[Democritus]

Cheers, Unicorn.
So it’s for determining how flat a surface is?
D.

 

[TheUnicorn]

Cheers, Unicorn.
So it’s for determining how flat a surface is?
D.

just showing the results of a google search, but reading the blurb I'd say you push in the centre and it tells you how deep a dip is, I imagine for metal engineering. not quite sure how it does internal and external measurements though

 

[Droogs]

looks like a simplified dial test indicator with only a bit of dial

 

[AndyT]

If you look back at where TheUnicorn found my photo, you can also see a bit of the instructions and learn that the catalogue entry is from the 1935 Buck and Hickman.

https://taths.org.uk/queries/167-febson-indicator

 

[TheUnicorn]

sorry Andy, I should have included the link along with the picture