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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 of light.
ten/ one thousandths looks like an open barn door.
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 of light.
ten/ one thousandths looks like an open barn door.
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