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While it may have made sense to exchange the "Slide Rule Reference Scales" images as a ZIP archive of 700-pixel-wide GIF images in 1999, this seems like the typ

While it may have made sense to exchange the "Slide Rule Reference Scales" images as a ZIP archive of 700-pixel-wide GIF images in 1999, this seems like the type of project that's begging to be encoded as an SVG. Or a PDF as in some of the examples. I wonder how much error is introduced by storing these as pixel-aligned GIFs?

Someone 9y ago
At least three (I didn't test more) of the bitmap images under each of the "scales to make..." are links to PDF versions of the same scale. Also, the error for a pure monochrome version (that doesn't do subpixel resolution) would be at most 1/1400 pixel. Assuming a 1:10 scale for that, the error would be at most 10^(1/1400), or a factor of about 1.001646. (Of course, that would increase once you start using the slide rule)