>It's a technique that has been used by engineers for well over
>a century, it works well in practice ..
>try it, get two straight edges..
>Set squares will do .
>Place them back to back, hold then up to the light and look.
>One thousandth of an inch is just discernible as a thin sliver
>ten/ one thousandths looks like an open barn door.
Lovely.... was that how it was done with the large polished granodiorite surfaces? Must be an amazing video with that sarcophagus juggling act that must therefor have been done....... you see because I have done it with a bread slice-sized slab of diamond sawed quartz and just a 6" metal ruler and I don't see any light 6" away unless it's >>>>>>perfectly<<<<<<< lined up. How was that lining up accomplished on the sarcophagus?
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