> I love this....Thanks, dude. The Ronulator dominates. Explain real slow, > now, what each mark represents; 7 or 8 to one what? > xoDA On the wedge? Watch the hands - I gesticulate. On an 8:1 wedge, each millimeter of thickness is 8mm of distance from the vanishing point. Make a wedge. Set your calipers at 2, 4, 8, 10, etc millimeters, and mark where they fit the wedge. Interpolate in between for the intermediate value (s, depending on your choice of increments), and mark those. Behold the finished tool, a stone (maybe bronze) age principal rendering all the precision we need for the application, without batteries or algebra. Ok, I cheated with the digital caliper. The same thing is doable to similar accuracy resolution with a longer wedge and an analog rule measuring the fat end of the wedge against the length. The longer the wedge, the greater the accuracy. Ron N
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