File:Pick, shovel and pluck; further experiences "With men who do things" (1915) (14782084654).jpg

Identifier: pickshovelpluckf00bond (find matches)
Title: Pick, shovel and pluck; further experiences "With men who do things"
Year: 1915 (1910s)
Authors: Bond, A. Russell (Alexander Russell), 1876-
Subjects: Technology Engineering
Publisher: New York, Munn & Co., Inc.
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
d visit him, Monday, afterwe have seen the tunnel section sunk in the Harlem. When we reached the site of the Harlem tunnel, on thefollowing Monday, the tunnel section had already beentowed to the spot where it was to be sunk. At each end ofthe section, two large cylinders had been secured across thetubes. What do those cylinders mean.f^ I asked. We didntsee them here last week. Mr. Hotchkiss explained. When they sink the section,they will want to move it around until they bring it intoexact alignment with the section already sunk. They aregoing to use a couple of derricks for this purpose, but theywill hardly be powerful enough to support the weight of the A Hanging Office-Building. 169 heavy section unaided; with these cyHnders to buoy up thetubes, however, the weight on the derricks can be regulatedvery nicely to about five tons each, by filHng the cyHndersmore or less with water. *But I dont yet understand how they can fit such acumbrous section to the one already laid, said Bill.
Text Appearing After Image:
FIG. 10. HOW THE TUNNEL SECTIONS WERE LOCKED TOGETHER. Dont you see those steel masts at each end of thetunnel? asked Mr. Hotchkiss. They are location masts,and carry targets that are carefully centered over the outertubes. Surveyors on shore will sight those targets and signalwhich way the section must be moved to bring it into perfectalignment. That done, the section will be moved back untila couple of heavy pilot pins just above the two outer tubesenter widely flaring eyes in the previously sunk section. 170 Pick, Shovel and Pluck. A diver will be down there to drive a wedge through the pinso as to lock it fast. (See Fig. lo.) But/ Bill pursued, will that make the joint tightenough to prevent leakage when they pump the water outof the tubes? You forget that the tubes are to be buried in a mass ofconcrete. That scow, pointing to one alongside the tunnelsection, is the one that they are going to concrete the tunnelwith. Concrete hardens all right under water, but thedifficulty is to

Note About Images