Table of Contents
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The purpose of this manual is to furnish a basic understanding of your instrument
and how it can be used to solve many common building and construction problems.
Your instrument is precision made and capable of numerous applications. Listed in
the table of contents are a few representative building, engineering and farming
problems.
CONTENTS
1.
2.
3.
4.
5.
6.
6.1
6.2
6.3
6.4
6.5
7.
7.1
7.2
8.
8.1
8.2
9.
9.1
9.2
10.
11.
12.
13.
14.
15.
2 • • Berger Instruments
IMPORTANT!
READ THIS BEFORE USING THE INSTRUMENT
This quality Berger instrument has been inspected twice for accuracy before leaving
the factory. The instrument has also been given the best protection possible against
damage during transportation. Even with these precautions, the instrument is
subject to rough handling during shipment. To protect yourself against the possibility
4
of using an instrument which is out of adjustment, we suggest that you have the
instrument checked by a competent person before using it.
4
The following test can be performed to check the instrument's accuracy:
5
Set up the instrument in an area that is as level as possible and which is about 220
5
feet long. Place two matching level rods (or drive two pieces of strapping into the
6
ground) about 200 feet apart with the faces toward each other. Position and level the
6
instrument so that the distance from the instrument to each rod is the same
6
(measure) (Fig. 1A).
6
A
7
Fig. 1A
8
8
9
Fig. 2A
9
9
10
10
11
12
20 FT
12
Take a reading on each rod with the instrument (or mark each piece of strapping
12
where the crosshair is sighted). Note the difference and record them. Next, move the
13
instrument to another point in line with the two level rods as shown (Fig. 2A). Level
14
the instrument and take readings on the two level rods (or remark the two pieces of
14
strapping with the new crosshair sightings). The differences should be the same ( A -
A' should equal B - B'). The difference between A - A' and B - B' is the instrument
14
error at 200 feet.
15
Correction of instrument error should be performed by a competent repair
16
technician. The instrument should be rechecked periodically to assure
17
continued accuracy.
18
100 FT
100 FT
200 FT
A'
A
200 FT
B
B'
D
B
Berger Instruments • 3
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