------------------------------+----------+----------+----------+
|Number of | | Average |
Location. | days | Advance. | advance |
| worked. | | per day. |
------------------------------+----------+----------+----------+
Station 323 to Central Shaft | | | |
headings | 492 | 1,450 | 4.5 |
Bench and enlargement of | 159 | { 1,150* | 7.2* |
Central Shaft headings | | { 906**| 5.7** |
Central Shaft headings to | | | |
Weehawken headings | 141 | 620 | 4.4 |
------------------------------+----------+----------+----------+
[* Actual advance.]
[** Equivalent linear feet of full section tunnel.]
The best month's work in each location was as follows, the actual
yardage excavated and paid for being reduced to equivalent linear feet
of full section. The tunnels were generally taken out to full section,
except for a small amount left in the bottom, which latter reduced the
equivalent linear feet of full section to about 95% of the actual
advance at the face.
_Weehawken._--
Feet
Linear per
feet. day.
Full timbered section, North Tunnel Nov., 1905, 87 = 3.0
Sandstone " " May, 1906, 109 = 3.9
Trap (normal) South " July, 1907, 144 = 5.3
_Hackensack (All trap)._--
Feet
Linear per
feet. day.
Portal to Central Shaft headings,
South Tunnel May, 1907, 139 = 5.0
* Enlargement of headings,
" " Nov., 1907, 175 = 6.0
Central Shaft headings to Weehawken
headings, North Tunnel Apr., 1908, 145 = 5.2
[* The actual advance of the bench this month was 202 lin. ft.]
_Central Shaft Headings._--During April, 1907, 122 lin. ft. of heading,
averaging 3.8 cu. yd. per lin. ft., were taken out in the South Tunnel,
west of the shaft. This was equal to 5.0 ft. per day for the 24 days
worked.
_The Best Week's Work._--The best week's work at either of the main
working faces, when the full section was being excavated in trap rock,
was 803 cu. yd., equal to 41.8 lin. ft. of full-section tunnel, or an
average of 6.0 lin. ft. of full section per day; this was from the South
Tunnel at Hackensack for the week ending January 11th, 1908.
_The Best Yardage._--The largest number of yards taken out in any one
week from one working face was 1,087, equivalent to 56.6 lin. ft. of
full section, or an average of 8.1 lin. ft. of full section per day.
This was bench and enlargement only (Central Shaft headings) in the
North Tunnel, Hackensack, for the week ending October 19th, 1907.
The largest yardage for the whole work in any one week was 3,238 cu. yd.
from four working faces--two at Weehawken in full section and two at the
Hackensack bench and enlargement (Central Shaft headings). This was
equivalent to 168.4 lin. ft. of full-section tunnel, or an average of
6 ft. per day from each working face.
_The Best Month's Work._--The best month's work with each of the four
methods of drilling the headings, as shown in Figs. 1, 2, 3, and 4,
where the work was straight forward and the full section was being taken
out, was as follows:
Method No. 1 About 90 ft. in sandstone.
" No. 2 " 100 " in trap.
" No. 3 " 137 " in trap.
" No. 4 " 145 " in trap.
In regard to these figures it should be noted, as stated previously,
that the organization of the men and plant was not properly completed
until near the time Method No. 4 was put in operation.
In Fig. 9 is shown graphically the relation of the progress to the time
elapsed in the North Tunnel, the diagram for the South Tunnel being
almost exactly the same.