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Scientific American, Vol. 90, No. 5 (1904) (1904)

leaf 40

An illustration from Scientific American, Vol. 90, No. 5 (1904), 1904, leaf 40
tii JANUARY 30, 1904. … standing the enormous distance, every duty, at the various exchanges. Men were formerly employed for night work, word and sound in the building in which but this arrangement proved unsatisfac- the speech was delivered were heard with tory. This branch of the service gives such conspicuous…

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