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and in reality it is nothing more than a Circular Sliderule with Sine scale only, it can also be used as an ASPECT RATIO (AR) tool:
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Sure Don, well spotted!
I had thought that since it is -as you say- a sine scale there should be some way of reading it, but I did not dig deeper because I use another item for calculating the AR. But you found it and it is much easier than I had thought at first sight