CHAPTER 1. INTRODUCTION

Figure 1. Theodolite, front view.

Theodolite; Directional 2/10 Sec, Degree Graduation 10.2-In. Long Telescope W/ Accessories Page Navigation
1

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1. Scope

d. Report all deficiencies in this manual on DA

Form 2028. Submit recommendations for changes,

a. These instructions are for the use of the

additions, or deletions to the Commanding Officer, U.

personnel to whom the Wild Heerbrugg Model T-3

S. Army Mobility Support Center, ATTN: SMOMS-MS

Theodolite is issued. Chapters 1 through 5 provide

Box 119, Columbus 16, Ohio.

Direct

information on the operation, preventive maintenance

communication is authorized.

services, and organizational maintenance of the

equipment, accessories, components, and attachments.

e. Report

all

equipment

improvement

Chapter 6 provides information for field and depot

recommendations as prescribed by TM 38-750.

maintenance (3d, 4th, and 5th echelons). This manual

also provides descriptions of the main units and their

2. Record and Report Forms

functions in relationship to other components.

For record and report forms applicable to the

b. Appendix I contains a list of publications

operator and organizational maintenance, refer to TM

applicable to this manual. Appendix II contains the

38-750.

maintenance allocation chart. Appendix III contains the

list of basic issue items authorized the operator of this

Note

equipment.

The organizational, field, and depot

maintenance repair parts and special tool lists are listed

Applicable

forms,

excluding

in TM 5-6675-231-25P.

Standard Form 46, which is carried

c. Numbers in parentheses on illustrations indicate

by the operator, shall be kept in a

quantity. Numbers preceding nomenclature callouts on

canvas bag mounted on the

illustrations indicate the preferred maintenance

equipment.

sequence.

Section II. DESCRIPTION AND DATA

Illumination of the vertical, horizontal, and micrometer

3. Description

circles during daylight operation is accomplished by

The Wild Heerbrugg Model T-3 Theodolite (figs. 1

adjusting the illumination mirrors (figs. 1 and 2). A

through 4) is a precision, directional type surveying and

battery-powered electrical illumination system is

tracking instrument. It has both vertical and horizontal

provided for night operation. Eyepiece prisms for

circle scales, calibrated in degrees for reading the value

attachment to the telescope and microscope eyepieces

of angles. Such readings are observed through the

during high-angle and astronomical observations are

microscope eyepiece (fig. 3). A micrometer circle (fig.

contained in the accessory case. The telescope is

4) is provided for the interpolation of angle value

equipped with a 30-power eyepiece, optional eyepieces

readings to 2/10 second degree accuracy.

The

of 24 and 40 power, which are stowed in the carrying

horizontal circle housing contains the 3 leveling screws

case base, and may be installed when necessary.

(fig. 1) to which a star plate (fig. 1) for tripod mounting

is attached.

AGO 5078A

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