THE COAST ARTILLERY JOURNAL - Air Defense Artillery

214 THE COAST ARTILLERY JOURNAL
which was used was the horizontal projection of the line of sight through the
burst from the battery position. A light construction line was drawn along
this edge, which gives the same line L-3 (Figure 6) as previously d..e;~ribed in
paragraph (a) 3.
(4) Similarly, the plotter is set parallel to 5"1' and at the siant range
from the flank station to the target. The deviation of the burst as obse;ved from
the flank station was set as described above and that part of the construction
line 5-8 (Figure 6) drawn that intersects the lateral deviation line. This intersection
C (Figure 6) was the horizontal projection of the burst as described
in paragraph (a) 4.
Flc. 7. XYLO:'liIT£ PLOTT£R
(5) Similarly, the vertical projection of the line of sight through the
burst was drawn parallel to the line of position, and the point C (Figure 6)
projected to this line, giving the vertical projection of the burst along the line
of fire.
(6) The main advantage of using this plotter is that instead of plotting
one burst at a time, ten or more can be plotted with each set up in very little
more time than one burst. But care must be taken in properly marking the
construction lines so that they can be identified.
c. By use of xylonite plotter and Universal Drafting Machine. (1) The
xylonite plotter mentioned before was fitted, with an attachment which allowed
it to be used on a drafting machine so that any edge could be placed parallel to
any of the basic lines and clamped. Thus, in any position on the drawing board
it would always be parallel to the line by which it was first set.
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