orty-second remain immovable as long as a notch is in engagement which support the roof and sides of the tunnel. The Street, the work has been opened up from Duane with the circular part, but when the eccentric part is steel framework, as shown in the engraving, is made Street to 181st Street on… … during the inoperative position of the The two interior views of the sub- Interior View, Showing Steel Framing Before Concreting. Approach to Subway, Showing Portal in Distance. Portal of Subway at 136th Street. fB0O££SS 07 TEE HEW YOBS SAFIO TBANSIT TUNNEL. 11901 SCIENTIFIC AMERICAN, INC.
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