In the preceding frames, figures, and fold-
air gap = /2 N
= 11.6 X 3
= 34.8 micro inches
distance between mating surfaces have been used.
You should understand that in all cases these
are ______ because the gage block mating surface
_________ because the gage block mating surface
has a _________ slope.
The interference bands at A and B in fold-
out 12 are not ______ ______ because the surface
of the piece under measurement has a ___________
which is not _________ .
In addition to the _______ in the _______ of
interference bands, the shift of the ________ of
__________ at B has caused a change in the
__________ between _____________ __________ .
The optical flat application which we are
about to discuss can be called height or refer-
ence dimension measurements. However, we will
not use the long term reference dimension meas-
urements, we will refer to the application as
If 1/2 of the light source used in fold-
out-14 is 11.6 micro inches, the difference in
the heights of the two blocks is ________ micro