h is so advanced that it is now possible to get a good abutment of the steel viaduct across Manhattan it. The two deep shafts at 167th and 181st Streets idea of the appearance of the inside of the tunnel as it Valley cammences. This viaduct, which will are down to grade, and the drifts are being… … equally distant from the shaft. the following manner: After the 8 inches of concrete has been After the three-quarter point carefully smoothed off, a layer of the flange gradually approaches the center. From this arrange- hot asphalt is spread upon it, ment it follows that the two ends do not meet,…
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