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a. The advantage of the Central Command in being able to obtain accurate information of enemy members and equipment from that distance is necessary.
10. A separate sending and receiving set will be installed in each battery of major calibre artillery for communication between Air Service and battery, and observation plane and battery for fire control.
11. Radio telegraph sets are installed in Air Service planes. All Commands in the Department are equipped with the same sets and panels for communications with Air Service observers.
12. Visual Signals
1. Visual Signals are classified as:
(a) Panels:
1. Panels are divided into three classes:
(a) Identification.
(b) Rectangular or signalling.
(c) Marking.
2. Identification panels are used in the Department as follows:
(a) To identify location of units for air-plane observer.
(b) To designate location of message dropping
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