Weight ....................................................... 106 lb

b. Plotting board chest

a. Board plotting M18

Length........................................................ 44 In

Azimuth calibration.................0 to 6400 mils clockwise

Width ......................................................... 44 in

Grid scale...............................40 millimeters = 1000

Height ........................................................ 11 in

meters

Weight ....................................................... 118 lb.

Diameter (without

c. Plotting board M18 W/E

brackets) ...........................41 in

Total weight (packed in chest) ............................... 224lb

Height ....................................35 1/2 in

obtained, will depend to a large degree on the exactness

of the operators.

This section contains the overall functional theory of

(1) If the base line 00' (fig. 1-3) Is plotted on the

the board plotting.

grid disk, and the azimuth of the target as observed

functional theory with each self test discussed

from each observation post is laid off along the lines OT

separately.

and O'T, the point of intersection of the two lines will be

the true observed position of the target The azimuth of T

from any point can be determined easily by measuring

The purpose of this section is to familiarize

the angle between the line connecting that point and T,

personnel with the function of the board plotting. The

and grid north line, and the horizontal range of OT or

information presented provides both a basic and a

O'T or any other desired line, can be determined readily

detailed understanding of the board plotting

by scaling off the distance, using a straightedge

graduated to the same scale as the grid disk In practice,

however, the X and Y coordinates of the point are the

a. General. The theory of the plotting board is

information usually desired.

fundamentally simple, and accuracy of the results

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