-6-
GENERAL DESCRIPTION
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.
Sighting and Focusing
The vial notches
2
are used for preliminary
sighting. To focus on an object, sight
through the eyepiece
3
and bring the
crosshairs into focus by turning the
eyepiece cap
3
. After the crosshairs
are sharp and distinct, look through
the eyepiece at the object and turn the
focusing knob
4
until the object appears
sharp and clear.
All focusing is internal. The telescope
does not move outward or inward
as objects are focused. David White
Universal instruments utilize the smooth
precision of a rack and pinion mechanism
for focusing.
Focus range is from six feet to infinity. For
closer focus, turn the knob clockwise. For
farther focusing, turn counterclockwise.
Leveling Vial
The instrument leveling vial
5
is factory
aligned and is graduated to facilitate
centering the bubble.
Horizontal Measuring
The horizontal circle
6
can be rotated for
easy angle setting and reading and is
divided in quadrants (0-90°). The circle is
marked by degrees and numbered every
10 degrees.
The horizontal circle lock
7
assures
accuracy by preventing the horizontal
circle form being moved accidentally.
Turn clockwise to tighten.
The horizontal vernier
8
permits dividing
whole degrees into fractions of 1⁄12° (5
minutes).
Approximate horizontal sightings are held
firmly in place by means of a clamp
9
.
Then, precise horizontal settings can be
made with the tangent
10
. The clamp
must be hand tightened firmly before the
tangent will function.
The telescope moves up and down 45
degrees, and rotates 360 degrees, to
measure vertical and horizontal angles.
When using instrument as a level
, both
telescope lock levers
11
must be in a
closed position when the instrument is to
be used as a level; open when used for
vertical sightings.
Vertical Measuring
The vertical clamp
12
holds the telescope
at a vertical angle. Fine vertical settings
can be made with the tangent
13
. The
vertical clamp must be hand tightened
firmly before the tangent will function.
The vertical arc
14
is divided in degrees
and numbered every 10 degrees up to 45
degrees, for both upward and downward
angles.
A vertical vernier
15
permits dividing whole
degrees into 5-minute increments.
Shifting Center
The shifting center
16
facilitates accurate
placement of the instrument over a point.
Four screws
17
are used for leveling the
instrument. The instrument is mounted to
the tripod by screwing the 5/8-11 base to
the tripod head.
