levelling and bore alignment Flashcards
1
Q
to level means ?
A
to put into the same plane as the horizon
2
Q
what does plumb mean?
A
to align perpendicular to horizon
3
Q
square refers to something that is ?
A
aligned 90 deg to a reference line
3
Q
optical tools use and control light rays with various ?
A
lenses and prisms
4
Q
what is an other word for cross hairs?
A
reticle
5
Q
prisms control the direction of light rays through ?
A
refraction and reflection
6
Q
precision targets used with an optical micrometer is can read to ?
A
one thousand of an inch
-one ten thousands when used with a vernier scale
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