move
scale
sighting
optical
reflecting
line
circle
fine
objects
distance
45°
pivots
position
vertex
measuring
lock
thumbscrew
90°
path
interference
angle
shades
star
light
arc
shading
sun
arm
eighth
sight
reflected
measured
graduated
direct
navigator
pinnula
mirrors
observer
mutual
telescope
octant
navigation
doubles
view
horiizon
spanning
rotation
intervals
frame
measure
point
index
observations
reflection
mirror
vernier
aligning
mounted
distant
minute
observing
shade
turn
both
/pos
reflect
moving