David White LT8-300LTU, Owner'S Manual

-9-

The following examples will explain how 

to read the degree and vernier scales on 

the circle.

Exact Degree Reading

The point at which 0 on the vernier scale 

touches the circle

. 

If the 0 coincides 

exactly with a degree line on the circle, 

your reading will be in exact degrees. 
There are no fractions of degrees, or 

minutes, to be added to the reading. The 

horizontal circle reading in 40°.

Fraction (Minutes) Reading

If the 0 on the vernier does not coincide 

exactly with a degree line, your degree 

reading is the line which the 0 has just 

passed, reading up the degree scale, plus 

a fraction of the next degree. 
To determine the fraction, or minutes:
-  Start at 0 on the vernier and read up 

the vernier scale (in the same direction 

as you’re reading the degree scale) until 

you find a minute line that coincides 

exactly with a degree line. 

-  41° was the last degree line passed on 

the circle. 

  Reading to the right on the vernier 

scale, the minute line which coincides 

exactly with a degree line is 25’ 

(Reading is 41° 25’).

Remember, each line on the vernier scale 

represents 5’, so you will be reading 5’, 

10’, etc. the circle degree scale is being 

read to the left.

When reading the circle degree scale to 

the left, read up the vernier scale in the 

same direction.

-  Reading to the left on the vernier scale 

8

, the minute line which coincides 

exactly with a degree line is 45’.

Sighting and Focusing the 

Telescope

The telescope 

1

 provides a sharp image 

magnified 26 times. This means the 

object sighted appears 26 times closer 

than it would with the naked eye. 

Avoid touching the tripod while sighting.

-  Aim the telescope at the object and 

sight first through the notches 

2

 on 

the top of the level vial for preliminary 

sighting. Look through the telescope 

eyepiece 

3

 and focus the crosshairs 

using the eyepiece adjuster

 3

. 

-  Then bring the object into focus using 

the focusing knob 

4

.

-  Rotate the instrument until the 

crosshairs are positioned on or near 

the target. Tighten the horizontal clamp 

9

 and make final settings with the 

tangent fine tuning knob 

10

 to bring the 

crosshairs exactly on point.

When sighting through the telescope, 

keep both eyes open.

 You will find that 

this eliminates squinting, will not tire your 

eyes and gives the best view through the 

telescope. 

Remember to avoid touching the tripod 

while sighting.