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Transatlantic Radio Telephone Measurement chart, 1923

PHOTOGRAPHS - SOFT NEGATIVES
Safety negative
Rosenfeld and Sons
USA, NY, New York
1926-03-04
Overall: 10 x 8 in.; 25.4 x 20.32 cm
m331877

8X10 safety negative taken by Rosenfeld and Sons on March 4, 1926. Image of AT&T Transatlantic Radio Telephone Measurements Chart. Visible in image: "Transatlantic Radio Telephone Measurements / Diurnal Variation of Percentage of Disconnected Words Understood / Typical Winter Day -1923 / Typical Summer Day~1923", chart with x representing Greenwich Mean Time and Eastern Standard Time and y representing % Disconnected Words Understood. Typed on original negative sleeve: "A T & T Co-195 Bdway, City. / Mr. R W King, Room 536 / Copy of chart at our studio".

1984.187.24641

1 Related Media Item

m331877

Related Subjects: Telephone   
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