How To Use A Watch Bezel Slide Rule
Contributed by Mark Carson of Individual DesignIf you've ever seen a watch with a slide rule bezel and haven't known how to use it, we have a little guide for you.As many of you know, watches with slide rule functions have 2 logarithmic scales (the outer of which turns). In contrast, a tachymeter scale is hyperbolic and typically has numbers that run in from infinity down to sixty. Both slide rule and tachymeter watches use non-linear scales. Let's look a bit at a generic scale.NOTE - the images shown are a bit rough as they are not photographs of an actual circular slide rule. This scale might not look like all slide rule bezels, but there are analog indicators on most slide rule bezels so that the same functions can be used.The following examples show some common uses of a circular slide rule:Calculating a 15% tip (I know, I'm cheap) - just the tip amount in this case:The goal: Calculate 15% of $20.00.Set the outer ring's "1.5" (for 15%) over the inner ring index ("1").Find "2" (for

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