possible to get a good the steel viaduct across Manhattan abutment of it. The two deep shafts at 167th and 181st Streets idea of the appearance of the inside of the tunnel as it Valley cr.nimences. This viaduct, which will are down to grade, and the drifts are being pushed will look when completed.… … equally distant from the shaft. the following manner: After the Fig. 1.- THE MIRO&BAFH ACTTTATING AND Fig. 2.—THE MIBOGRAFH ARRANGED FOB 8 inches of concrete has been After the three-quarter point OBTURATING MECHANISM. TAKING A PHOTOGRAPHIC NEGATIVE. carefully smoothed off, a layer of the flange…
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