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 52 of 93 (55%)
page 52 of 93 (55%)
 | |
|
| | | | | |
Mixed |Rock cut | 90+55 | 90+44.4 |Feb. 25, '08|Mar. 3, '08| --------------+-----------------+---------+---------+------------+------------+ --------------+------+--------+--------+--------------------------------------+ | | |Rate of | | |Number| |progress| | | of | Linear |in feet | | Material. | days.| feet. |per day.| Remarks | --------------+------+--------+--------+--------------------------------------+ {| 7} | | {|Stopped to brace portal. No work done | {| 14} | | {|from March 12th to October 11th, 1905,| Rock {| 38} | 54 | 0.77 {|except a little trimming in September.| {| 10} | | {|All work up to this date done in | {| 15} | | {|normal air. Heading advanced to 106+70| {| } | | {|and bulkheaded. | | | | | | Rock | 26 | 53 | 2.04 | | | | | | | | | | {|Heading advanced to 106 + 40. Shut | Mixed | 21 | 7 | 0.33 {|down in order that Line D might have a| | | | {|lead. | | | | | | Mixed | 38 | 38 | 1.00 {|Shut down on account of air shortage. | | | | | | Mixed | 18 | 32 | 1.78 |Shut down on account of air shortage. | | | | | | Mixed | 30 | 30 | 1.00 |Shut down April 20th to July 27th, | | | | |1906. | | | | | | |
|
