Category: History - Warfare
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...
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 Descri...
2. 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...
3. 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 recei...
4. 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 consi...
5. 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 Inve...
6. 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...
7. CHAPTER I.While, in consequence of the development of electrical invention and improvement, visual signaling will be less frequently resorted to in future than heretofore in the service o...
8. CHAPTER II.The wand is a stick of light wood about 18 inches long and one-half inch in diameter. It is held loosely between the thumb and forefinger and waved rapidly to the right or left...
9. CHAPTER III.International Code use ICU (Navy) telegraph dictionary use TDU (Navy) geographical list use GLU (Navy) general signal use GSU Navy list use NLU Vessel's numbers use VNU Cipher "...
10. CHAPTER IV._Definition._--The term "field message" is applied to all messages sent over field lines of information. All field messages for transmission over field lines of information by e...
11. CHAPTER V.In field operations tactical considerations will usually prescribe within certain limits the number and general location of signal stations. The general directions for deploymen...
12. CHAPTER VI.A code is a list or collection of arbitrary words or groups of letters to each of which some ordinary word, proper name, phrase, or sentence is assigned for meaning.
13. letter X, 8 of K, 16 of B, 13 of C, 80 of I, N, O, and S; 85 of A, 90If messages are enciphered by a mere transposition of the letters of the alphabet, the cipher disk can be used to quickly decipher the message, as the following example will sho...
14. CHAPTER VII.When light falls on a transparent body, part is reflected and part is refracted. The angle which the ray makes with the normal, or perpendicular, to the surface at the point of...
15. part 4 of this specification.6. _Marking._--Glasses furnished under this specification shall be marked on one barrel with the words "Signal Corps, U. S. Army," and on the other barrel "Serial No. ----." Ser...