Reversal Methods - Absolute Measurement
One of the simplest places to see reversing is in calibrating a
if I = indication - Ia first measure Ib second
measure with level reversed.
and el = error in level
and et = error in table..
Ia = et + el
Ib = et - el
The rest is just simple math..
Dan Gelbart briefly mentions it..
A related process happens in the 3-plate method to get a perfectly
I found this..
Generational delinquency - degredation of straightness, flatness
There is a problem in machining - the error in the tool transfers to
the error in the work - so if you use a tool to create another tool
- things just get worse - reversal methods are the cure..
Using 2 plates instead of 3
This trick - lets one use 2- plates... But I would make it nicer..