Tunnel shields and the use of compressed air in subaqueous works
Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb. "Greathead, and the introduction of shield work in recent years."--Chapter I Appendix: A. A chronological list of events connected with tunnelling by means of a shield or of compressed air. B. Some English patents relating to tunnelling with shield and compressed air, 1818 to 1904
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