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A platform for research: civil engineering, architecture and urbanism
Pantographs give tunnel cross-section
As applied to rapid cross sectioning of tunnel excavation, pantograph has arm that is extension of one side of parallelogram; tip of arm traces actual tunnel outline; for small tunnels, pantographic action is direct; for large tunnels, pantographic action is translated to parallel plotting plane.
Pantographs give tunnel cross-section
As applied to rapid cross sectioning of tunnel excavation, pantograph has arm that is extension of one side of parallelogram; tip of arm traces actual tunnel outline; for small tunnels, pantographic action is direct; for large tunnels, pantographic action is translated to parallel plotting plane.
Pantographs give tunnel cross-section
Eng News-Rec
Engineering News-Record ; 149
1952
Article (Journal)
English
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