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 49 of 93 (52%)
page 49 of 93 (52%)
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--------------+------+--------+--------+--------------------------------------+
| | |Rate of | | |Number| |progress| | | of | Linear |in feet | | Material. | days.| feet. |per day.| Remarks | --------------+------+--------+--------+--------------------------------------+ {| 21} | | {| | {| 11} | | {| | Rock {| }51| 48 | 0.94 {|Excavation done in normal air and | {| 4} | | {|before advance of shield. | {| } | | {| | {| 15} | | {| | | | | | | Rock | 86 | 87 | 1.01 | | | | | | | Mixed | 26 | 36 | 1.38 | | | | | | | Mixed | 17 | 33 | 1.94 | | | | | | | Earth | | | | | | 33 | 73 | 2.21 | | | | | | | | | | | | Earth |206 | 639 | 3.10 | | | | | | | | | | | | Mixed | 58 | 75 | 1.30 | | | | | | | Mixed | 45 | 68 | 1.51 | | | | | | | |
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