330 MANUAL rOR NONCOMMISSIONED OFFICERS. 



station with which it is desired to commutiicate. The first 

 motion (the dot) is to tiie right of the sender, and will em- 

 brace an arc of 90°, starting with the vertical and returning 

 to it, and will be made in a plane at right angles to the line 

 connecting the two stations. The second motion (the dash) 

 is a similar motion to the left of the sender. The third mo- 

 tion (front) is downward directly in front of the sender and 

 instantly returned upward to the first position. Front is used 

 to indicate an interval. 



24. The beam of the searchlight, though ordinarily used 

 with the shutter like the heliograph, may be used for long- 

 distance signaling, when no shutter is suitable or available, 

 in a similar manner to the flag or torch, the first position 

 being a vertical one. A movement of the beam 90° to the 

 right of the sender indicates a dot, a similar movement to the 

 left indicates a dash; the beam is lowered vertically for 

 front. 



25. To use the torch or hand lantern, a footlight must be 

 employed as a point, of reference to the motion. The lantern 

 is most conveniently swung out upward to the right of the 

 footlight for a dot, to the left for a dash, and raised vertically 

 for front. 



Note. — To call a station, make the call letter until acknowl- 

 edged, at intervals giving the call or signal of the calling 

 station. If the call letter of a station is unknown, wave flag 

 until acknowledged. In using the searchlight without shutter 

 throw the beam in a vertical position and move it through an 

 arc of 180° in a plane at right angles to the line connecting 

 the two stations until acknowledged. To acknowledge a call, 

 signal "Acknowledgment " followed b^ the call letter of the 

 acknowledging station. 



Signaling with Heliograph, Flash Lantern, and Searchlight 

 (With Shutter.) 



GENERAL SERVICE CODE. 



26. The first position is to turn a steady flash on the receiv- 

 ing station. The signals are made by short and long flashes. 

 Use a short flash for dot and a long steady flash for dash. 



