Operator's Manual, Communication Instructions, US Navy (DNC 6, 1939?)

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These two chapters came in an old cloth-covered binder imprinted with
      Operator's Manual
Communication Instructions
              1939
          U.S. Navy

At some point the "Communications Instructions" and "1939" got marked through and "DNC 6" got stamped on.
Through Change 4, the pages are not marked DNC 6 but all the Change 5 pages are marked DNC 6.
So I am guessing that the original designation was changed at that time, whenever that was.

It looks like interesting information is missing - pages I-IV might have told us a little more about date and intended use. 
And it would be nice to see:
Appendix I - shore station circuits and frequencies - F broadcast schedules, etc.
Appendix III - international procedure per General Radio Regulations
Appendix VI - shore-based aircraft procedures
Appendix VIII - communications with merchant ships

Please send me e-mail if you have any more of this document, or info on its date, etc.

Download 12 MB pdf

Chapter 6. RADIO

Section A. General

• Fleet communications
• Ship radio communications
• Radio silence
• Replies from ships at sea
• Shore radio communications
• Aircraft communications
• Communications with merchant ships
• International distress and calling frequency
• Authentication
• Radio watch-keeping

Section B. Introduction to Procedure

• Reasons, basis, and use
• Operating rules and instructions
• Use of serial numbers

Section C. Radiotelegraph Procedure

• Prosigns
• Description and use of prosigns
• Message addresses
• Precedence prosigns
• Counting of groups
• Calling and answering
• Shore radio stations and indefinite call signs
• Repetitions, corrections, verifications, and acknowledgements
• Plaindress, abbreviated form
• The executive method
• F and I method
• F method by a shore station
• I method by shore stations
• Sample messages 1-4

Section D. Radiotelephone Procedure

• Purpose
• Component parts of a message
• Prowords
• Calling, answering, and transmitting simple messages
• Operating rules
• Executive method
• Additional procedure for airways radio stations and control towers

Section E. Radio Frequencies and Transmitter Adjustments

• Assignments of frequencies
• Classification of frequency bands
• Naval employment of frequencies
• Skip distance and fading
• Interference to naval circuits
• Frequency adjustments
• Monitoring and related services

Chapter 7. VISUAL PROCEDURE

A. Flashing Light and Semaphore Procedure

B. Flashing Light

C. Semaphore

D. Flag-Hoist Signaling

E. Miscellaneous