On Sat, 6 Mar 2004 22:28:10 -0600, "todd" scribbled:
A few hours. I made 3 48" straightedges. See the description of my experience.
You can do very sensitive detection of waves and ripples in cast iron table tops with very low angle light. The benefit is you can see the full plane at once versus just a line through it. Set up a bright light as far away as practical in a dark room (slide projector works great). Adjust the height until it just skims the table top.
-Bruce
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