d
arch, and was transported on tracks hung in part from the street
timbering.

_Completion._--Except in the heavily-timbered portions, such as at Fifth
Avenue, where the load had to be transferred from posts to the completed
masonry section by section, the lining of the tunnels presented no
special difficulty. The large number of small forms to be set, and the
mutual interference of the concreting and duct-laying operations proved
to be the most troublesome features of the work.

The restoration of the streets, public utilities, etc., at the open-cut
sections was a slow and tedious operation, but the tunnels themselves
were completed in March, 1909, 3 years and 10 months after the inception
of the work. The finished tunnels are shown by the photograph, Fig. 4,
Plate LXII, taken at the junction of the twin and three-track types.

FOOTNOTES:

[Footnote A: Presented at the meeting of December 1st, 1909.]

[Footnote B: Of the paper by Mr. Noble.]

[Footnote C: Of the paper by Mr. Noble.]

[Footnote D: Of the paper by Mr. Noble.]

End of the Project Gutenberg EBook of Transactions of the American Society
of Civil Engineers, Vol. LXVIII, Sept. 1910, by James H. Brace and Francis Mason

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