endent of the works. namental structure, of circular form, nine feet in diameter, its not the most successful, enterprise that New York has seen SKETCH OF THE HISTORY OF THE SYSTEM OF PNEUMATIC for many a day is the pneumatic tunnel under Broadway. A bed twenty-one and a half feet below’ the… … who has been excluded from its interior ; but hereafter the method of propelling carriages through tubes by atmospher- underground apartment, one hundred and twenty feet in ic pressure, and in 1826 he had a car running on this plan. incredulous public can have the opportunity of examining length,…
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