David White LT8-300, Owner'S Manual

-12-

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’.

The vertical arc 

14

 is read in the same 

way. 21° was the last degree line passed 

(when reading the arc degree scale to the 

right). 

-  Reading to the right on the vernier 

scale, the minute line which coincides 

exactly with a degree is 30’.

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.

Stadia Reticle.

All LT8-300 series instruments have a 

glass stadia reticle with two additional 

horizontal lines for use in determining 

distance.

Stadia

Hairs

A

B

L

Read the length “  ” of a level rod shown 

between the stadia hairs.