the intersection are recorded.

This procedure is

prescribed In (2) above so that the observers will not

repeated for as many flashes of the same gun as is

miss the succeeding rounds

practicable, up to a series of six flashes, if possible, at

(4) Six rounds are then fired and the azimuths of

which time a mean of the X and Y values recorded is

each burst are reported, plotted, and the coordinates

computed to give a mean center of flashes and,

recorded The site of each shot is reported and recorded

therefore, the observed location of the hostile battery

by the directing OP

f. High-Burst Ranging and Center of Impact

(5) A running total of the X and Y coordinates of

Adjustment.

each burst is recorded and from this the X and Y

(1) The coordinates of the observation posts having

coordinates of the mean center of bursts is computed

been previously plotted, a rough plot of the expected

and plotted

check point is made from coordinates furnished by the

(6) The range of this point, the center of Impact, is

firing battery commander if he has sufficient information

measured to the directing observation post.

to do so; otherwise a general area for observation is

(7) The Z coordinate, which is the elevation of the

designated

point of burst is calculated by the mil relation using the

(2) The azimuths to this point from each OP are

range and angle of site from the directing OP

determined by rotating the grid disk until the plotting

g. Test Problem The following test problem (fig. 1-4)

scale passes through the OP and the check point and

is given so that the operators may familiarize

then reading the plotting scale and vernier scale. These

themselves with the board and check the accuracy of

are transmitted to the individual OP's, together with the

the results obtained

approximate angle of site

(1) The coordinates of the observation posts are

(3) One round is fired and the azimuths are

given as follows:

reported and plotted The coordinates of this point are

OP1X = 26,000.0

Y = 10,000 0

not recorded since it Is plotted only as a check to see if

OP2X =22,300 0

Y = 08,400 0

each observer Is sighting properly on the same burst All

OP3X = 20,000 0

Y = 10,000 0

OP's not seeing the burst are given its approximate

OP4X = 21,300 0

Y = 13,700 0

azimuth (after it has been plotted) by the method

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