In calculating the air gaps at A and B in
Figure 5, the interference bands were counted
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from the edge of the gage block which was in
contact with the surface of the optical flat.
The line formed by the gage block edge is ident-
ified in foldout-10 as the _____ _____ ________.
We have implied that a gage block mating
bands which are _______ , and a gage block mat-
ing surface which has a _________ ________ will
The interference bands near the outer edge
of the optical flat at B in foldout-12 increase
in number and are spaced _________ together be-
cause the ________ of the surface is steeper in
You can see that the ______ of ______ at C
been shifted to the right of center. When
measurement at C is compared with A, you can
that the bands at C have _______ in ________
are spaced __________ together.
Look at foldout-14. The illustration shows
how you place an ______ _______ over two blocks
to compare the height of a block being measured
with the ______ of a standard block so that you
can determine the difference in the heights of
The height of block B can be determined by
adding the difference in heights of the two
blocks to height of the standard. If the height
of the standard is 0.050 inch, the height of
block B is ____________________ inch.