Notes on A Tunnel Survey

Abstract

The following is a description of the surveying methods used in constructing the tunnel under the East River between South Ferry, Manhattan, and Joralemon Street, Brooklyn. This tunnel was begun in March, 1903, and was opened to traffic in January, 1908. The tunnel consists of two parallel single-track tubes, of the usual cast-iron ring construction, having an interior diameter of 15 ft. 6 in. Under the river their distance from center to center is 28 ft., and under Joralemon Street it is 26 ft.