>
>
> If you get the plate to be less than five (5) lightbands of flatness, it
> certainly will be more than any home/hobbiest machinist will ever
> need!!! Getting the flat plate perfectly level is another issue.
Nothing near five wavelengths is necessary! Considering that
you are dealing with commercial Plex plate the inevitable thickness
variations will add significant error. But you can certainly build a
comb manometer of serious accuracy for a modest cost! And leveling it
is a snap, you have a built in level in the manometer tubes! Bill
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