COAST ARTILLERY, JOURNAL - Air Defense Artillery

:MORTAR FIRE CONTROL
Remark by the Coast Artillery Board:
3. i. The separation of the 2.bell and 3-bell data might be accomplishl"d
by sawing the display board horizontally in halves and by turning each part
fifteen seconds before it is due to be used.
Extract from report of critique:
3. j. Of the above, band h can be overcome by sufficient training of
the personnel.
4. CONCLUSIONS.
The experience of this battery indicates that the following modifications
should be made in the method of fire control as described 'in Coast
Artillery Board Project No. 117.
a. That a mcdi/ication be made to the deflection and elevation board~,
whereby interpolated data can be obtained directly from a scale attached to
the board, thus eliminating the use of the proportional dividers and the
services of two men. This modification should be one that could be made,
or at least attached, locally.
b. That either a large scale time-elevation or straight-line chart be supplied
to batteries by the Coast Artillery Board.
c_ That a method of supplying interpolated data fo~ tke I5-second intervals
for the B. C. instrument be included in the method.
d. That a method be devised, if possible, of separating the 2-be11 and
3-bell data .• The only suggestion is to use the mechanical display board for
the regular data and the special display board for the interpolated data.
e. The provision for supplying interpolated data should be separate but
superimposed on the regular system. This would simplify training of batteries
already well trained in the old system.
Remark by the Coast Artillery Board:
4. e. It is considered that the new system is already superimposed on
the regular system. If any break-down occurs a steady flow of 3-bell data
is insured.
Extract from report of critique:
5. RECOMMENDATION.
It is recommended that the system, with such of the above modifications
as may be adopted, be given a thorough test throughout the Coast Artillery,
with a view to its adoption in some form as the regular fire control system
for mortars.
24. An extract from 1st Indorsement, Headquarters, First Battalion~
4th Coast Artillery, and remark by the Coast Artillery Board thereon
are quoted:
2. b. Considering the numerous other activities of the battery during
the time the test firing was under consideration and the consequent short
period of actual drill on the fire control method as described by the Coast
Artillery Board, it is seen that this system can be adopted and used by
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