As mentioned before, I collect slide rules. Now that I have a variety of straight calculating styles, I've been emphasizing special-purpose rules. I have a couple for electronics, for example, and a couple of military ones for artillery calculations.
The other day I lucked into a bundled batch with several unusual rules:
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| This one will be of interest to my readers. I'm not sure how to use it yet, so feel free to weigh in with ideas. |
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| An interesting specimen that's outlived its usefulness. I'm thinking it was thrown in with a set to keep them buying those bulbs. Eventually you used the settings that you habitually did and fixed it in the darkroom. |
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| This is the one that caught my eye. Still not sure how to use it, but it's fun to speculate on. |
These are all cool, and all mystifying to me.
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