Basic support for multiple parallelogram unit was suitable rail truck with superstructure to carry main axis of pantograph which is made of series of parallelogram units; machines for two tunnels were designed to give scale of 1/12; establishing center line and datum level with aid of pantograph.
Pantographs plot tunnel cross-sections
Commonwealth Engr
Commonwealth Engineer ; 41 , n 7
1954
2 pages
Article (Journal)
English
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