Resolution of Problems Involving Mil Relations

at 5 meters (50/10 = 5) when using the range

dots are over, or parallel to, the same vertical

scale along the index line. When the range scale

line, or are the same distance from the same ver-

to the left of the index line is used, the small-

tical line, with the dot representing the location

est grid graduation for range represents 100 me-

ters; therefore, count each lateral grid gradua-

o f the target (T) toward the vernier scale.

(d) Read the WT azimuth, at the index

tion as 10 meters (100/10 = 10).

mark on the base, as 5830 mils. The total number

2. Angles involved are more than 30

of meters between the pencil dots when this posi-

mils. Read the graduations on the mil scale as

printed (10 mils each) and count each lateral

tion (1400 meters above the horizontal OP line

g r i d graduation as either 50 or 100 meters,

passing through the pivot plus 50 meters below)

is the weapon-target (WT), range 1450 meters.

depending on the range scale used. Other types

of mil relationship may be similarly obtained.

b. Determination of WT Mil Values from the

(b) Procedure. To determine the deflec-

Azimuth Scale on the Azimuth Disk.

tion correction in meters, using the range scale

(1) Problem 1. Observation post at center

along the index line (where the smallest grid

(pivot point) of the disk.

graduation represents 50 meters), proceed as in-

Observer (0) to Target (T)

dicated in 1 and 2 below.

Azimuth 800 mils

1. Starting with the O (zero) on the mil

Distance 2500 meters

scale at the index mark and with the pivot point

Observer (0) to Weapon (W):

of the disk representing the observer's location

Azimuth 2500 mils

(OP), rotate the disk until 25 mils (250 mils,

Distance 1250 meters

see (a) (1) and (2) above) is read over the index

WT = 348 mils.

mark.

2. From the index line at the 400-meter

(2) Problem 2. Observation post at center

graduation, measure laterally (perpendicular to

(pivot point) of the disk.

the index line) to the black centerline on the

Observer (0) to Target (T):

disk (counting each small grid graduation as 5

Azimuth 5900 mils

meters (see (a) (1) and (2) above). Note that

Distance 3200 meters

this distance measures two small grid gradua-

Observer (0) to Weapon (W):

tions, or 10 meters. Since the burst was to the

Azimuth 3850 mils

left of the OT line, the deflection correction is

Distance 1050 meters

right 10 (meters).

WT = 6159 mils.

(2) Problem 2.

(3) Problem 3. Observation post at center

(a) Given. Computer in the FDC has plot-

(pivot point) of the disk.

ting board Ml? and is controlling the adjust-

Observer (0) to Target (T):

m e n t of the sheaf on the base point. Range

Azimuth 2510 mils

Weapon to Base Point: 1700 meters. Observed cor-

Distance 1400 meters

rection for one weapon: Right 10 (meters) (1)

Observer (0) to Weapon (W)

(b) 2 above). Deflection setting on weapon: Right

Azimuth 1310 mils

30, base stake.

Distance 1810 meters

(b) Procedure. To determine the deflec-

WT-2702 (as read on the azimuth scale

tion correction to be placed on the sight, pro-

having red numerals).

ceed as indicated in 1 through 4 below.

c. Resolution of Problems Involving Mil Rela-

1. Set the 0 (zero) on the mil scale at

tions.

the index mark. With the pivot point of the disk

(1) Problem 1.

r e p r e s e n t i n g the weapon position, locate the

(a) Given. Observer has plotting board

(weapon-base point

1700-meter graduation,

Ml7 and is adjusting the sheaf of the weapons

range) on the index line.

on the base point. Observer (O) to Base Point:

2. From the index line at the 1700-me-

Distance 400 meters. Burst from one weapon:

ter graduation, measure off laterally (perpendi-

25 mils to left of its proper place in the sheaf

cular and to the left of the index line) two small

(measured with binocular at OP).

grid graduations, or 10 meters, and mentally

1. Angles involved are less than 30 mils.

note this point (grid intersection) on the base.

For ease in reading and to increase accuracy,

3. Rotate the disk until the black cen-

count each 10-mil graduation of the mil scale

terline intersects this point (grid intersection)

as 1 mil (10/10 = 1). Therefore, count the small-

and read the angle at the index mark on the

est grid graduation for lateral measurements only

base, in this case 6 mils.

2-5