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Scientific American, Vol. 54, No. 11 (1886) (1886)

leaf 5

An illustration from Scientific American, Vol. 54, No. 11 (1886), 1886, leaf 5
join the languidly supported, and it was only in 1879, when way system. Allthat now remains to be done is the sections together. It will be seen that the floor plates, an arrangement was made with Major Isaac, that the being 15 in. deep, are of sucha height that although connection of the tunnel… … it has a definite forward motion, ¢. e., at the top of the mainly of rock blasting, the workmen came on a following wave. It also lends itself to an arrangement copious spring of water at a depth of about 67 ft. TUNNEL, DRAINAGE AND VENTILATING HEADINGS, of steering gear by means of three or four…

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