Transactions of the American Society of Civil Engineers

Table 4

Location.	Number of days worked.	Total length of heading, in feet.	Average length of heading driven per day worked, in feet.
N.E.	227	446	1.96
S.E.	168	346	2.06
N.W.	272	768	2.82
S.W.	234	698	2.98

Progress at Hackensack.—At Hackensack the total number of days worked on the tunnels proper, all in trap rock (omitting the cut and cover) was about 792, divided as shown in Table 5.