In a footnote in Jerry Pinkepank's two-part article in TRAINS in the mid-60's about the Detroit and St. Clair tunnels (A Tale of Two Tunnels) is a comment about what happens when the surveyors get sloppy about their work. Apparently, the shields used to bore one of the H&M (now PATH) tunnels were allowed to drift out of line and there is a reverse curve in the tunnel where the shields had to be turned to get back into alignment.
mudchicken Back to QueCreek;
Back to QueCreek;
Thanks, MC...for the comprehensive answer on said subject.
100% totally agree, if the surveyors of the past had not done accurate work....anything used now to read from their remaining records...{maps}, would have been useless.
Mine surveying was in some cases not very easy work....Depending on the seam of coal. Example: My dad helped with survey work back 60 some years ago and he mentioned of doing some work where the "roof" was just 2' in height....
Item: The location of the rescue bore to the miners at Quecreek was located just a very short distance from a farmers lake {pond}....Fortunately, it was where it was and not where they needed to drill.
Quentin
CSSHEGEWISCH In a footnote in Jerry Pinkepank's two-part article in TRAINS in the mid-60's about the Detroit and St. Clair tunnels (A Tale of Two Tunnels) is a comment about what happens when the surveyors get sloppy about their work. Apparently, the shields used to bore one of the H&M (now PATH) tunnels were allowed to drift out of line and there is a reverse curve in the tunnel where the shields had to be turned to get back into alignment.
A tale of two tunnels 2 Trains, October 1964 page 40 the Detroit and St. Clair river tunnels ( CANADA, GT, MICHIGAN, NYC, ONTARIO, "PINKEPANK, JERRY A.", TUNNEL, TRN )
Hmm - don't think I have those 2 issues yet. Will have to get them, if only for this reason. Thanks for mentioning it !
- Paul North.
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