A device for measuring the diameter of spheres to a reasonable degree of accuracy, not much more to say really, I made this one for a school physics experiment, and its shown here with a charming man inside for lack of a sphere in the local vicinity. (Note how I cunningly avoided saying 'lack of balls'!)
2 bits of acrylic, some steel rod, a broken rule, and 2 minutes on a pillar drill, and you can have your very own!
The Carpenter.
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