the cross-headings toward the face. The muck was carried out by two
cableways, one on each side of the completed middle wall, each of which
was supported by a tower outside of the tunnel and a large hook-bolt
grouted into the rock at the inner end of the tunnel. Forms were built
for each tunnel complete, and the concrete was delivered by a belt
conveyor, running over the top of the lagging, and moved out as the
tunnel was keyed.

[Illustration:
Fig. 12.
TERMINAL STATION SKETCH SHOWING TWO TRACK TUNNELS
AT NINTH AVENUE AND THIRTY-THIRD STREET]


FOOTNOTES

[1: Presented at the meeting of May 4th, 1910.]

[2: Reproduced as Plate IX in the paper by Mr. Noble.]

[Text reference for footnote 2:
"one arm of the creek shown on General Viele's map of 1865"
The article is ASCE 1152, The East River Division, available from