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Scientific American, Vol. 32, No. 1 (1875) (1875)
leaf 4
n in cross section of the frame. These supports are so arranged as to leave strongly points to the necessity of carefully and frequently in Fig. 18, The two single tunnels are 18 feet high from the sufficient room for the passage of trains. They consist of cleaning the forward portions of the… … AVENUE, BETWEEN 92d AND 94th STREETS ! NEW YORK.—THE ROCK TUNNELS, FOURTH © 1875 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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