File:Fig 02 - Spring Line Level in Advance of Brick Arch, North End of Tunnel No. 3.jpg
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![File:Fig 02 - Spring Line Level in Advance of Brick Arch, North End of Tunnel No. 3.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/bc/Fig_02_-_Spring_Line_Level_in_Advance_of_Brick_Arch%2C_North_End_of_Tunnel_No._3.jpg/800px-Fig_02_-_Spring_Line_Level_in_Advance_of_Brick_Arch%2C_North_End_of_Tunnel_No._3.jpg?20180520062143)
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