File:Bell telephone magazine (1922) (14756688375).jpg

Identifier: belltelephonemag19amerrich (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
10 A.M. 9 A.M. 8 A.M. 7 A.M. FIG. 7 The record of the ground potential difference between Minneapolis, Minn., and Fargo,N. D., on the morning of March 24, 19^0 wave circuits on the transatlanticroutes were interrupted on Sundayand a number of days thereafter.Figure 9 shows graphically the pe-riods of interrupted service on thetransatlantic route on March 24 and25. Radiotelephone services to South America and across the Pacific wereaffected considerably less than thoseacross the Atlantic, and service to theCaribbean region through Miami, andcoastal and harbor radiotelephoneservices were practically free frominterruptions. Radio disturbances
Text Appearing After Image:
4 A.M. 3 A.M. 2 a.m. FIG. 8 The similar record on the following morning i9^0 Sun Spots and Telephone Service 195 EFFECT ON TRANSATLANTIC SHORTWAVE RADIOTELEPHONE SERVICE OF MAGNETICDISTURBANCE OF MARCH 24,1940. MARCH 24TM. ^ARCH 2 5TH. «.r„. P.M. r~„,. ,„. 12 I 23456789 10 II 12 123456769 10 II 12 I 23456769 10 II 12 1234 5 6 7 6 9 10 II 12 :£ = = =■■■■■■■■■■■■■■■■■■■■■■■■■■)«■■- 1 PERIODS IN EASTERN STANDARD TIME.Wm PERIODS UNCOMMERCIAL DUE TO ATMOSPHERIC CONDITIONSCD PERIODS AVAILA6I-E TO TRAFFIC. FIG. 9 Interruptions to transatlantic radiotelephone service on March 24 and 25 also increase towards the upper lati-tudes, which accounts for the greatereffects on the transatlantic circuits. Only a small portion of the tele-graph services of the Bell System isnormally handled over grounded tele-graph circuits. Some of these serv-ices, which had not already been ar-ranged to operate on a metallic or ona balanced wire basis,

Note About Images