468 



BELL SYSTEM TECHNICAL JOURNAL 



« 



EXPLANATION OF SYMBOLS 



F-FOG 



- GENERAL CONDITIONS - 



0-CLEAR R - THUNDERSTORM 



(D-PT. CLOUOV R-RAIN 

 ffi- OVERCAST 5- SNOW 



- CEILING - 



IN HUNDREDS OF FEET 

 U- UNLIMITED 



- VISIBILITY - 



IN MILES 



- WIND DIRECTION - 



ARROWS FLY WITH THE WIND 

 ;N tS C-CALM 



Q-WIND SHIFT 



• NE ^ SW 



« E «• W 



■SS E *^NW 



- WIND VELOCITY " 

 IN MILES PER HOUR 



- TEMPERATURE - 



IN DEGREES FAHRENHEIT 

 EXAMPLE:- 39>0 CEILING 300 FT., OVERCAST, VISIBILITY 10 mI. 



65^15 TEMP. 65°F, WIND S W, 15 Ml. PER HOUR 



Pig 3— Weather map, the notations of which were transmitted and directly printed 

 by the teletypewriter system. 



