.

AT&T Long Lines Message Traffic, 1902-1929

.

Not adjusted for “the estimated effect of transfers of business between the long lines department and the associated companies.”

.

.

Data estimated from charts in AT&T, Summary of Business Conditions in the U.S., Oct. 1925, and Oct. 1929 issues

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dateave. daily messages (1000s)

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Dec-190214

.

Dec-190630

.

Dec-191032

.

Dec-191340

.

Dec-191438

.

Sep-191860

.

May-192083

.

Dec-192179

.

Jun-1923100

.

Jul-1924100

.

Sep-1925112

.

Sep-1927122

.

Sep-1929168

.

.

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equivalent growth per year from Dec. 1902 to Sept. 19299.7%