Book-bot.com - Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 - The New York Tunnel Extension of the Pennsylvania Railroad. - The East River Tunnels. Paper No. 1159 by Woodard, S. H.;Mason, Francis;Brace, James H.

Transactions of the American Society of Civil Engineers, vol. LXVIII, Sept. 1910 - The New York Tunnel Extension of the Pennsylvania Railroad. - The East River Tunnels. Paper No. 1159 by S. H. Woodard;Francis Mason;James H. Brace
page 40 of 93 (43%)

| | | | | |
All rock |Center heading | 72+67 | 76+54 |Mar. 19, '07|Sept 6, '07|
| | | | | |
Earth and rock|Going out of rock| 76+54 | 77+24 |Sept 6, '07|Oct. 4, '07|
| | | | | |
All earth |Soft ground | 77+24 | 90+57.3 |Oct. 4, '07|Mar. 26, '08|
--------------+-----------------+---------+---------+------------+------------+

--------------+------+--------+--------+--------------------------------------+
| | |Rate of | |
|Number| |progress| |
| of | Linear |in feet | |
Material. | days.| feet. |per day.| Remarks |
--------------+------+--------+--------+--------------------------------------+
All rock | 54 | 39.1 | 0.724 | |
| | | | |
All rock | 57 | 85 | 1.49 | |
| | | | |
Earth and rock| 39 | 70 | 1.79 | |
| | | | |
Earth and rock| 45 | 55 | 1.22 | |
| | | | |
All rock | 8 | 22 | 2.75 | |
| | | | |
Earth and rock| 26 | 56 | 2.15 | |
| | | | |
All rock | 171 | 387 | 2.26 | |
| | | | |
Earth and rock| 28 | 70 | 2.50 | |
| | | | |