ixed | 25 | 45 | 1.40 | |
| | | | |
Mixed | 72 | 155 | 2.15 | |
| | | | |
Rock | 18 | 15 | 0.83 | |
| | | | |
Rock | 25 | 92 | 3.68 |Twelve days' delay to repair cutting |
| | | |edge. |
| | | | |
Mixed | 8 | 24 | 3.00 | |
| | | | |
Mixed | 18 | 38 | 2.11 | |
| | | | |
Rock | 61 | 139 | 2.28 | |
| | | | |
Mixed | 8 | 10 | 1.25 | |
| | | | |
Rock | 1 | 4 | 4.00 | |
| | | | |
Mixed |109 | 211.34| 1.94 | |
--------------+------+--------+--------+--------------------------------------+

Openings were made between the headings as follows:

Tunnel _D_, February 20th, 1908;
Tunnel _B_, March 3d, 1908;
Tunnel _C_, March 5th, 1908;
Tunnel _A_, March 18th, 1908.

It was necessary to cut away the projecting floors of the working
compartments before the cutting edges could be shoved together.

_Contractor's Organization._--Tunnel operations were carried on
continuously for thirteen days out of fourteen, regular work being shut
down for repairs on alternate Sundays. When the required pressure was
more than 32 lb., four gangs of laborers were employed, each gang
working two shifts of 3 hours each, with an intermission of 3 hours
between the shifts. When the pressure was less than 32 lb., three gangs
were employed, each gang covering 8 hours, but with a