45

46

In calculating the air gaps at A and B in

Figure 5, the interference bands were counted

No Response Required

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 _____ _____ ________.

52

straight

53

We have implied that a gage block mating

flat

surface which is flat will produce interference

evenly

bands which are _______ , and a gage block mat-

spaced

ing surface which has a _________ ________ will

constant

cause the interference bands to be ____________

_____________ .

60

evenly

61

The interference bands near the outer edge

spaced

of the optical flat at B in foldout-12 increase

slope

in number and are spaced _________ together be-

constant

cause the ________ of the surface is steeper in

that area.

67

increase

68

You can see that the ______ of ______ at C

number

has

been shifted to the right of center. When

point

the

measurement at C is compared with A, you can

contact

see

that the bands at C have _______ in ________

spacing (distance)

and

are spaced __________ together.

interference

bands

75

height

76

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 blocks.

83

84

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.

52

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