CHAPTER 1 INTRODUCTION - TM-9-1220-223-140007

CHAPTER 1

INTRODUCTION

Section I.

GENERAL

1-2. Forms, Records and Reports

1-1. Scope

a. This manual contains instructions for opera-

a. Authorized Forms. Refer to TM 38-750. For

tor, organizational, direct support, general sup-

listing of all forms refer to DA Pam 310-2.

port, and depot maintenance for indirect fire plot-

b. Report of Accidents. T h e necessary reports

ting board M17 W/E (1220-588-7282).

are prescribed in AR 385-40.

b. Appendix A is a list of current references,

including supply and technical manuals, forms

1-3. Reporting of Errors

and other publications applicable to plotting

board M17.

Report of errors, omissions, and recommenda-

c. Appendix B contains a maintenance alloca-

tions for improving this publication by the indi-

tion chart which lists maintenance responsibili-

vidual user is encouraged. Reports should be sub-

ties allocated to each category of maintenance.

mited on DA Form 2028 (Recommended Changes

d. Appendix C contains basic issue items, or-

t o DA Publications) and forwarded direct to

ganizational, direct support, general support, and

t h e Commanding Officer, Frankford Arsenal,

depot maintenance repair parts and special tools

A T T N : AMSWEMAFW3100, Philadelphia,

list.

P a . 19137.

Section Il.

DESCRIPTION AND DATA

index line (8) is semicircular. The top and bottom

1-4. Description

edges are straight and parallel to each other,

a. General. Plotting board M17 (fig. 11) is

from the right edge to the index line. The surface

a portable fire control instrument designed to

of the base is roughened slightly to receive pencil

help the operator in computing firing data for

markings during firing problem computation. In

range and azimuth of a target for indirect firing

addition to the plotting board name and model

of the weapon. The plotting board utilizes known

number, the base contains those markings on its

range and azimuth data from the weapon to an

surface described in (a) through (f) below. Print-

observation post, in combination with reported

ing on the base surface is black, unless otherwise

data received from the post concerning location

stated.

of the target with respect to the post. It is used

(a) The right edge of the base has a scale

to compute geometrically the range and azimuth

8 inches long graduated in inches from O to 7

of the target from the weapon.

in one direction, with each graduation subdi-

b. Basic Components. Plotting board M17 (fig.

vided into tenths of an inch. The remaining 1

12) is a two-part assembly and consists funda-

inch, from O to 1 in the opposite direction, is

mentally of a base (2) and an azimuth disk (1).

divided into twentieths of an inch.

(b) The top edge of the base has a scale

(1) Base. The base (6) (fig. 1-3) is com-

9 centimeters long graduated in centimeters from

posed of white laminated plastic to which a

1 to 9 and reading from right to left. Each gradu-

pivot (1) is secured to accommodate the azimuth

ation is divided into millimeters. The figures 1

disk. The azimuth disk is centrally mounted, and

through 9 and the letters MM are red.

may be rotated on the pivot. The base is square

on the right edge. The left edge, beginning at the

1-1