You mean about the proportion working for all values? No joke. If you think about it, it has to work like that since the two scales are fixed. You set the relationship between them once and leave it in that position, then you are just looking at different points along the scale to see the corresponding number on the other scale. So 1/2 = 2/4 = 3/6 etc.
I remember when I was a kid my uncle had a slide rule and showed me how to use it. It was amazing how many different kind of calculations you could do. Of course I’ve forgotten most of what he said, but I remember how cool it was.
You mean about the proportion working for all values? No joke. If you think about it, it has to work like that since the two scales are fixed. You set the relationship between them once and leave it in that position, then you are just looking at different points along the scale to see the corresponding number on the other scale. So 1/2 = 2/4 = 3/6 etc.
I remember when I was a kid my uncle had a slide rule and showed me how to use it. It was amazing how many different kind of calculations you could do. Of course I’ve forgotten most of what he said, but I remember how cool it was.
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