THE COAST ARTILLERY JOURNAL - Air Defense Artillery

216 THE COAST ARTILLERY JOURNAL
in the manner shown in Figure 6, G being the projection of the plinth and H
the column. The burst in question is then projected by a continuation of the
vertical deviation construction Iine and the lateral deviation in yards is, measured
off from the vertical line through the projected danger space, shown in
Figure 6 as perpendicular to the line of position. This gives the pos~ion as
shown at E, which is the position of the burst as seen from the battery. -Therefore,
to be a hit this burst, if it landed in the plinth, must be in the plinth projected
or if in the column, it must land in the projection of the column. In
the example (Figure 6), the hurst was not a hit although it was in the column
as for range and vertical, but was not in the column projection for lateral
deflection.
FIe. 8
ORC~ .."'c.f: DEPART~E""T It, ... G •
~-. - 1 I. /- •
,~ _" ~.. rl'" r'" ,~
- .. .- - .
d. In any case where a burst landed close to the edge of the superimposed
danger space and had a chance of being a hit for deflection, it was replotted to
a scale of 1 inch equals 10 yards. This practically assures a correct plot.
7. Another method of obser\"ing and plotting was submitted by the 6-tth
Coast Artillery, but was received too late to be used, as it required the construction
of a special flank observing instrument. This instrument is so designed
that it observes the longitudinal deviations along the line of position.
The bursts could then be plotted directly in the slant plane containing the line
of position, using the impact charts made up for target angles for e\-ery ten or
twenty mils. These could be constructed before the firings.