WIRE COMMUNICATION AIDS TO AIR TRANSPORTATION 467 



each line. First the starting time, 0642 E. S., which is 6:42 a.m. 

 Eastern Standard Time, is shown. Each reporting station in sequence 

 then gives its code letter or letters and follows with a report of its 

 observations. An interpretation of the report from the first station is 

 "Newark, overcast, lower broken clouds, occasional sprinkling, esti- 

 mated ceiling height 600 feet, visibility 2>^ miles, wind velocity 8 miles 

 per hour, direction northeast, temperature 42°, dew point 40°, baro- 

 metric pressure 30.10 in." The time of actual transmission for all 14 

 stations, Newark to Cleveland, is generally about four minutes. 



At 50 minutes past the hour the three radio stations will interrupt 

 the beacon signals and broadcast the reports just received. Hadley 

 station transmits the weather sequence received from stations between 

 Newark and Bellefonte; simultaneously, the Bellefonte radio station 

 transmits the entire sequence received from all points between Newark 

 and Cleveland, and the Cleveland radio station broadcasts reports 

 from points between Bellefonte and Cleveland. All three radio sta- 

 tions include in the sequence, reports of weather at Cleveland and 

 New York. The range beacons are not interrupted for these reports 

 for longer than two minutes, and if the reports require a longer period 

 the beacon signals are restored for one minute and again interrupted 

 to complete the reports. 



Based upon the information obtained through the sequence collec- 

 tions, the airway weather reporting station retransmits, generally by 

 teletypewriter, hourly weather reports to the various airway operating 

 companies' offices in that vicinity. Airway companies maintain 

 various arrangements for posting the weather information for the 

 convenience to pilots. Some companies post the information on a 

 series of boards of different color arranged in geographic sequence to 

 represent different airway routes, each board indicating a particular 

 point on that route. 



An experimental service involving the transmission of weather 

 summaries in map form has been tried out recently at Kansas City, 

 Chicago, Cleveland, Newark and Washington. A separate circuit 

 equipped with page teletypewriters at each of these points was pro- 

 vided for this purpose. The weather maps were prepared at Kansas 

 City and Cleveland every three hours. A typical map, the notations 

 of which were transmitted over the circuit and directly printed by the 

 teletypewriter, is shown in Fig. 3, and the following describes briefly 

 the methods used. 



Two special airways maps, ordinary letter width, have been printed, 

 one map covering the section of the country east of the Mississippi 

 River and another the section west to the Rocky Mountains. The 

 maps are printed in ink which permits hectographic reproduction. The 



