File:East river tunnel bulkhead.jpg

DescriptionEast river tunnel bulkhead.jpg	English: Construction of the East River Tunnels, 1909. Concrete bulkhead, which was set every 1000 ft during construction of the tunnel. At the bottom, there are two air locks for the passage of men and material, at the top, there is an emergency air lock. Deutsch: Bau der East River-Tunnel, 1909. Betonschottwand, wie sie während dem Bau der Tunnel alle 300 m gesetzt wurde. Unten befinden sich zwei Luftschleusen für den Durchgang von Arbeiter und Material, oben eine Notfall-Schleuse.
Date	1909
Source	Construction of the East River Tunnels, 1909. Image from Japp, Henry. The New York Tunnel Extension of the Pennsylvania Railroad: Contractors' Plant for East River Tunnels. Paper No. 1160. Proceedings of the American Society of Civil Engineers. vol. 69, plate 9. (October 1910). archive.org
Author	Unknown photographer
Permission (Reusing this file)	This image comes from the "Full View Books" section of the Google books archives and is also available on archive.org. This is an image that has come from a book or document for which the American copyright has expired and this image is in the public domain in the United States and possibly other countries.
Other versions	This file has been extracted from another file : East river tunnel.jpg

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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• 2010-09-03 18:23 Gwythoff 455×770× (56342 bytes) Construction of the East River Tunnels, 1909. Image from Japp, Henry. "The New York Tunnel Extension of the Pennsylvania Railroad: Contractors' Plant for East River Tunnels." Proceedings of the American Society of Civil Engineers. vol. 35, no. 9. (N