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This Compass Features a Familiar Mechanism Similar to Camera Apertures
Great for making 20-sided polygons. Even with a ruler, it would be extremely difficult if not impossible to perform any of these operations:
This is really nice. Rather than the heirloom steampunk aesthetic I'd like to see a cheap plastic one for distribution to elementary schools. I recently worked with a class of second graders on a STEM project that required a traditional compass to draw circles and it was nearly impossible for their level of coordination. Sure, a circle guide does the trick too, but this is quite elegant.