File:Bell telephone magazine (1922) (14733456246).jpg

Identifier: belltelephonemag09amerrich (find matches)
Title: Bell telephone magazine
Year: 1922 (1920s)
Authors: American Telephone and Telegraph Company American Telephone and Telegraph Company. Information Dept
Subjects: Telephone
Publisher: (New York, American Telephone and Telegraph Co., etc.)
Contributing Library: Prelinger Library
Digitizing Sponsor: Internet Archive

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o that assurance may be had that themessage has been received. This will also enable the pilot to callthe ground station and ask for such information as he needs. The radio apparatus discussed in (1) and (2) is supplied ingeneral by the Department of Commerce as part of its functionunder the Air Commerce Act of 1926 in providing navigationaids. However, Transcontinental Air Transport has providedsimilar transmitters for its landing fields not equipped by theDepartment of Commerce. The receiving sets in the airplanesare owned by the airplane operating companies. The radiorange beacon has been in operation on the Cleveland-NewYork route for more than a year. Recently it has been in-stalled at Goshen, Sterling and Des Moines, and the Chicagoand Boston beacons are now being installed. The radio range beacon is operated in conjunction with theradio telephone stations. It is stopped every fifteen minutesand identified by station announcement followed by correct 41 4 BELL TELEPHONE QUARTERLY
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42 COMMUNICATIONS FOR AVIATION time and weather reports. This system has a number of ad-vantages in that the pilot does not have to change the tuningof his receiver and is Hstening at all times for either radiorange beacon signals or weather information. In this way itis possible to interrupt the beacon at any time and communicateemergency messages to the pilot in flight. The accompanying map shows 25 government ground radiotelephone stations for transmitting weather information toplanes, in service on October 15, 1929. The map also shows5 stations operated by Transcontinental Air Transport, 14 sta-tions under construction and 29 proposed stations. The two-way telephone apparatus discussed in (3) is notprovided by the Department of Commerce. This two-waytelephone communication will be required by the airplane op-erators who undertake the transport of passengers. These op-erators must provide every means possible to insure the safetyof passengers and it is expected that they will provi

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