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Scientific American, Vol. 61, No. 16 (October 1889) (1889)

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An illustration from Scientific American, Vol. 61, No. 16 (October 1889), 1889, leaf 0
rmined, must have been very sheet steel, the last being presumably the better mate- high. In practice, it is believed, and claimed by the rial for actual practice. The tube being 30 inches in « in » Everybody Satisfied—Of the 55,000 exhibitors at proprietors, that a speed of 300 miles an hour will… … THE JOHNSON PNEUMATIC TUBE FOR THE QUICK TRANSPORTATION OF FREIGHT AND MAILS. ©1889 SCIENTIFIC AMERICAN, INC.

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