Wednesday, August 12, 2026

the old fashioned way of doing the math on something... was a couple whiz wheels on a "computer" that would calculate


https://forestservicemuseum.pastperfectonline.com/webobject/4DC629ED-46C0-4252-8036-920519243300
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1 comment:

  1. Flagg7:53 AM

    I don't know how to use that but I can use a slide ruler. I need to find one just to nang on the wall.

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