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TM-9-1220-223-14 Fire Plotting Board M17 W/E [1220-588-7282] Manual
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Figure 1-2. Indirect fire plotting board M17.
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
(c) The vernier scale (3) on the top edge
on the right edge. The left edge, beginning at the
1-1

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