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Brunson
Measuring Instruments
771
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Brunson 771 - Page 18
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Manual
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Model 771, 75, and 76-RH190 Transits
14
Later
in
this
manual,
we
will
discuss
some
of
the
optical
tooling
techniques
which
re
‐
quire
backlighting
of
the
reti
‐
cle
using
one
of
these
adapt
‐
ers.
Figure
2.10
17
19
Table of Contents
Main Page
Default Chapter
3
Table of Contents
3
Chapter 1: Introduction
5
What Is a Transit
5
What Does a Transit Do
5
The Three Different Transits
8
Chapter 2: Getting Started with Your Transit
11
Handle Your Transit with Care
11
Removing from the Case
12
Using the Shifting Center
12
Rough Leveling
12
Precise Leveling
13
The Reticle
15
How to Properly Focus
15
Finding Infinity Focus
15
Pointing the Telescope
16
Installing Lighting Accessories
16
Chapter 3: Measuring Techniques
19
Bucking in
19
Autoreflection
21
Autocollimation
23
Collimation
27
Collineation
30
Reticle Projection
31
Measuring with Micrometers
32
Chapter 4: Field Calibration Checks
39
Plate ("Bull's Eye") Vial
41
Micrometer Checks
42
Double Center" Check
44
Horizontal Axis Runout
45
Vertical Spindle Runout
46
Horizontal Centering
47
Horizontal Collimation
48
Plumb Line Check
50
Cross-Axis Telescope Collimation
53
Peg Test
55
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