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Scientific American, Vol. 32, No. 1 (January 1875) (1875)
leaf 4
ains. They consist of cleaning the forward portions of the boiler tubes, and railroad grade to the top of the arched roof, and 18 feet 8 three beams for each end of the rib, two vertical and one in- other parts which do not -come in direct contact with the inches wide at the bottom: or, allowing 32… … Fig. 18.-THE UNDERGROUND RAILWAY IN NEW Y0RK.-THE ROCK TUNNELS, FOURTH AVENUE, BETWEEN 92d AND 94th STREETS! © 1875 SCIENTIFIC AMERICAN, INCPatents · Iron · Address · Color · Improved · Scientific American · Boiler · Science record · Postage included · Base piece · Steam engine · Letters patent · Sewing machine · Attorney general · Find directions · Grand cash
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