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
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| | | | | |
All rock |Bottom heading | 71+65 | 71+91 |Feb. 7, '07|Feb. 13, '07|
| | | | | |
All rock |Center heading | 71+91 | 75+81 |Feb. 13, '07|July 20, '07|
| | | | | |
Earth and rock|Going out of rock| 75+81 | 76+56 |July 20, '07|Aug. 25, '07|
| | | | | |
All earth |Soft ground | 76+56 | 90+44.4 |Aug. 25, '07|Mar. 17, '08|
--------------+-----------------+---------+---------+------------+------------+

--------------+------+--------+--------+--------------------------------------+
| | |Rate of | |
|Number| |progress| |
| of | Linear |in feet | |
Material. | days.| feet. |per day.| Remarks |
--------------+------+--------+--------+--------------------------------------+
All rock | 127 | 131.1 | 1.03 | |
| | | | |
Earth and rock| 114 | 172 | 1.51 | |
| | | | |
All rock | 6 | 26 | 4.33 | |
| | | | |
All rock | 157 | 390 | 2.48 | |
| | | | |
Earth and rock| 36 | 75 | 2.08 | |
| | | | |
All earth | 205 |1,388.4 | 6.77 | |
--------------+------+--------+--------+--------------------------------------+