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Saturday, June 13, 2015

Slide Rules - with a difference

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:

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.


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.
This is the one that caught my eye.  Still not sure how to use it, but it's fun to speculate on.

1 comment:

  1. These are all cool, and all mystifying to me.

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