side was excavated down to sub-grade, the east portion of the south
abutment was constructed, and six rows of the permanent steel viaduct were
erected. Very little excavation had been done on the west side of the
avenue at the south end of the work, and it would have delayed the
completion of the work to have waited for the excavation for and the
construction of the west portion of the south abutment and the erection of
the steel; therefore, instead of supporting the girders "C" on the central
rock core, the east ends were taken up on the permanent viaduct girders,
and the west ends were supported on a concrete pier on the rock. The
central portion of the avenue was excavated in advance of the west portion.
The permanent viaduct girders were put in place from east to west across
the avenue, and the girders "C" were supported on the deck of the permanent
viaduct approximately under the west elevated railway columns before the
west portion of the avenue was excavated, the central portion of the south
abutment having been constructed before the west portion. This procedure
was adopted only at the north girders "C" at elevated railway column No.
488, the south set of girders "C" being on the rock immediately south of
the south abutment. Figs. 2 and 4, Plate XLIX, and Fig. 2, Plate LII, show
various stages of the work at the south end.

[Illustration: PLATE XLIX, FIG. 1.--TW 60, P.T. & T.R.R. Co. Terminal
Station West. Under Ninth Ave., looking South from North abutment, showing
underpinning and excavation of rock core. Aug. 13, 08.]

[Illustration: PLATE XLIX, FIG. 2.--TW 84, P.T. & T.R.R. Co. Terminal
Station West. View looking toward Ninth Ave. from South side of 31st St.,
200 feet West of Ninth Ave. Jan. 28, 09.]

[Illustration: PLATE XLIX, FIG. 3.--TW 88, P.T. & T.R.R. Co. N.R. Div.
Terminal Station West. Center line of 32nd St., looking East from Sta.