TABLE OF CONTENTS.

Page.
Chapter I.—Introduction[9]
Chapter II.—Visual signaling equipment.
The wand[11]
The flag kit:
The 2-foot flag kit[12]
The 4-foot flag kit[12]
Care of flag material[13]
Powers and limitations of flag signaling[13]
The heliograph:
Historical[14]
Description[14]
Assembling[17]
Adjustment[20]
Operation[21]
Care of apparatus[22]
Powers and limitations of the heliograph[22]
The signal lantern:
Acetylene[23]
Calcium carbide[23]
Method of gas generation[24]
Description[25]
Operation and care[30]
Powers and limitations of the signal lantern[35]
Rockets and shells:
Description[35]
Operation[38]
Employment[40]
The semaphore: Description[40]
The searchlight: Methods of employment[41]
The Coston signals[41]
Very's night signals[42]
The Ardois system of signaling[42]
Sound signals[44]
Improvised signal methods[44]

Chapter III.—Alphabets or systems of signals.
Signal alphabets:
American Morse[45]
Continental Morse[45]
Army and navy[45]
Abbreviations[46]
Code calls[47]
Execution of signal alphabets[47]
The army and navy alphabet[47]
The Morse alphabets[49]
International code of signals:
Description[51]
Two-arm semaphore[51]
The Ardois system[52]
Coston signals[54]
Very's night signals[54]
Rocket signaling[55]
Two-arm semaphore alphabet, U. S. Navy[57]
Summary of signals, army and navy alphabet[60]

Chapter IV.—The field message.
Definition[64]
The blank form[64]
Writing the message[66]
Instructions to operators:
Use of message blank[66]
Duties of sending operators[66]
Order of transmission[66]
Duties of receiving operators[67]
Communications confidential[67]
Checking the message[67]

Chapter V.—The signal station.
Location of stations:
General considerations[68]
Backgrounds[70]
Azimuth of stations[71]
Altitude[71]
Determination of background color[72]
Choice of apparatus[73]
Miscellaneous considerations[73]
Intervisibility table[74]
Finding a station[75]
Operation of stations:
Personnel[76]
Calls and personal signals[78]
Opening communication[79]
Commencing the message[80]
Sending and receiving[80]
Breaking[80]
Discontinuance of transmission[81]
Acknowledgment of receipt[81]
Station records[81]
Formation of signals[82]
Repeating the message[83]
Signal practice[83]

Chapter VI.—Codes and ciphers.
Codes in use[84]
Employment of codes[84]
Cipher code[85]
The War Department Code[86]
Cipher code in field work[87]
Field ciphers:
Description and use[87]
Forms of field cipher[88]
Inversions[88]
Concealment of terminations[88]
Cipher apparatus: The cipher disk[89]
The mathematical cipher[93]
The route cipher[94]
Cipher detection: Employment of cipher disk[96]

Chapter VII.—Field glasses and telescopes.
Reflection[98]
Refraction[98]
Lenses[98]
Focus[99]
Optical center[99]
Image[99]
Conjugate foci[99]
Law of foci[100]
Formation of image[101]
Spherical aberration[102]
Chromatic aberration[102]
Telescopes[104]
Galilean field glasses and telescopes[106]
Porro prism field glasses and telescopes[106]
Field glasses[108]
Properties of telescopes and field glasses[109]
Power[109]
Light[111]
Field[114]
Definition[115]
Field glasses and telescopes issued by the Signal Corps[119]
Type A[121]
Type B[124]
Type C[125]
Type D[125]
Field-glass specifications[126]