. Engineering and Contracting. D y n a niite for blasting, in lbs 100,400 206,000 Bricl\Work, cu. yds Structural steel (i n c 1 u ding Pier 72), 50,000 ,000 ,000 lay while not affording any inaterial saving inthe time of construction. It was thouglit desirable to construct theshafts on the two sides of the river in advanceof letting the main contracts for the Manhattan Shaft is north of the line ofthe tunnels, on the north side of 32d St., eastof Eleventh Ave. The Weehawken Shaft ison the line of the tunnels in the yards of theErie R. R. on the New Jer
. Engineering and Contracting. D y n a niite for blasting, in lbs 100,400 206,000 Bricl\Work, cu. yds Structural steel (i n c 1 u ding Pier 72), 50,000 ,000 ,000 lay while not affording any inaterial saving inthe time of construction. It was thouglit desirable to construct theshafts on the two sides of the river in advanceof letting the main contracts for the Manhattan Shaft is north of the line ofthe tunnels, on the north side of 32d St., eastof Eleventh Ave. The Weehawken Shaft ison the line of the tunnels in the yards of theErie R. R. on the New Jersey side, and thedistance between the shafts is about 6,575 contracts for these shafts were let inJune. 1903, to the United Engineering and Con-tracting Company, and they were completedand ready for use at the time of letting themain contract for the tunnels, thus saving con-siderable time. The Terminal Station-West, Between Ninthand Tenth Avs.—In the original design it wascontemplated to have a four-track tunnel un-. SIDE ELEVATION TRANSVERSE SECTION Fig. 5—Arrangement of Structures Supporting Ninth Ave. Elevated Railroad. I04 ENGINEERING-CONTRACTING Vol. XXXIII. No. s- der 32d St. from Ninth to Eleventh Aves., butowing to the necessity for having additionalyard faciHties, property was bought for about100 ft. north and 100 ft. south of 32d St., be-tween Ninth and Tenth Aves., and an openexcavation, hned with concrete retaining wallsand face walls, was made. Between Ninth and es. This work was executed by the ORourkeEngineering Construction Co. It was possible to excavate in full rock coverabout ft. of the tunnels eastward from theWeehawken Shaft and 22-5 ft. westward fromthe Manhattan Shaft. At these points cover was verv thin, and there shield of course, the decision as to the practicabilityof such plans rested with the board. Inasmuch as the shield method of construc-tion was required, the writer designed a shieldfor use in the North River tunnels. T
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