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I assume it doesn’t actually function as a slide rule, it might need a magnifying bulls eye the size of the glass.

Think I still have one circular slide about the house someplace, linear ones there at least two, one has instructions with it.
 
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I assume it doesn’t actually function as a slide rule, it might need a magnifying bulls eye the size of the glass.

Think I still have one circular slide about the house someplace, linear ones there at least two, one has instructions with it.
No, it's just "inspired by" slide rules. I think it's a bit of a shame they didn't include the other 12 numbers (13 - 24) somewhere on the dial.

I have a linear one in my study, it was my father's, no idea how to use it!