AMERICAN SOCIETY OF CIVIL ENGINEERS

INSTITUTED 1852


TRANSACTIONS

Paper No. 1152


THE NEW YORK TUNNEL EXTENSION OF
THE PENNSYLVANIA RAILROAD.

THE EAST RIVER DIVISION.

BY ALFRED NOBLE, PAST-PRESIDENT, AM. SOC. C. E.




A general outline of the work included in this Division has been given
by General C. W. Raymond, M. Am. Soc. C. E., in the first paper of the
series. The few pages following are intended only as a note to connect
his paper with the more detailed descriptions of the execution of the
work, which will be supplied by the Resident Engineers in immediate
charge.

Soon after the Company's project was made public, in the latter part of
1901, borings were begun in the East River, and a few weeks later in
Manhattan and Long Island City. A preliminary base line was measured on