U. S. SIGNAL AND TELEGRAPH CODE.

(Authorized by G. O. No. 59, A. G. O., June 28, 1889.)

ALPHABET.

A ·-F ·-·K -·-P ·····U ··-
B -···G --·L ----Q ··-·V ···-
C ·· ·H ····M --R · ··W ·- -
D -··I ··N -·S ···X ·-··
E ·J -·-·O ·T - Y ·· ··
Z ··· ·· ···

NUMERALS.

1 ·- -·3 ···- -·5 - - -7 - -··9 -··-
2 ··-··4 ····-6 ·····8 -····0 ----

PUNCTUATION MARKS.

Comma ·-·-Interrogation -··-·Parenthesis Pn
Semicolon SiQuotation QnBrackets Br
Colon KoParagraph - - - -Dollar mark Sx
Period ··- -··Exclamation - - - ·Dash Dx
Hyphen HxUnderline Ux

Note.—A fraction is made by inserting a dot between the numerator and denominator:

Example, ⅞ - -·· · -····

SIGNALS AND ABBREVIATIONS.

TO SIGNAL WITH FLAG OR TORCH.

The flagman faces exactly toward the communicating station; staff is vertical in front of centre of body, butt at height of waist. The dot (·) is represented by a motion to the right, and the dash (-) by a motion to the left of the sender. The space, whether separating elements of spaced characters (C, O, R, Y, Z, and "&"), or separating words, will be represented by a "front" motion.

Thus the motions:

Right, right, front, right, represent C.

Right, front, right, represent O.

Right, front, right, right, represent R.

Each motion will embrace an arc of 90°, starting from and returning to the vertical.

The long dash (letter "L" and numeral "naught") is distinguished from the "T" dash by a slight pause at the lowest point of dip, and with this exception there will be no pause whatever between the motions required for any single letter.

A slight pause will be made between letters.

At the end of each word, abbreviation, or conventional signal the space signal, or "front" motion, is made, preceded and followed by a pause equivalent to that made between letters.

CONVENTIONAL SIGNALS FOR HELIOGRAPH OR FLASH LANTERN.

To Call a Station.—Turn a steady flash on the station and keep it there until answered by a steady flash. Both stations will then adjust, each on the other's flash. When adjustments are satisfactory, the station called will acknowledge and cut off its flash, and the calling station will proceed with the message.

Adjustment.—If the receiver sees that the sender's mirror needs adjusting, he will turn on a steady flash until answered by a steady flash. When adjustment is satisfactory, the receiver will acknowledge, and the sender will resume his message.

CONVENTIONAL SIGNS FOR FLAG OR TORCH.[23]

To Call a Station.—Signal the "call letter" of the station required, or, if the call letter be not known, signal "A" without pause until acknowledged. The calling station will then proceed with the message.

To Acknowledge a Call.—Signal "I" three times followed by "front" and the call letter of the acknowledging station.

To Break or Stop the Signals from the Sending Station.—Signal "A" without pause until acknowledged.

To Start the Sending Station after Breaking.—Signal "G A" followed by "front" and the last word correctly received; the sender will immediately resume his message, beginning with the word indicated by the receiver. If nothing has been received, signal "R R"; the sender will then repeat all.

Error in Sending.—Signal seven dots (·······) rapidly followed by "front," and resume the message, beginning with the last word correctly sent.

End of Address.—Signal the period (··--··) followed by "front."

Signature Follows.—Signal "Sig" followed by "front."

To Acknowledge Receipt of a Message.—Signal "O K" followed by "front" and personal signal or initial of receiver.