• Previous Schemes.

  • Description of the Tunnel.

  • Large Diameter of the Tunnel.

  • Open Approaches.

  • Cut-and-cover Work.

  • Shaft.

  • The Shaft Caissons.

  • Sinking the Caissons.

  • Use of Compressed Air.

  • The Cast-Iron Tunnel.

  • Lining the Tunnel.

  • Compressed Air used for Driving the Tunnel.

  • Air-Locks.

  • The Trial of “Pilot” Tunnel.

  • The Shield.

  • Starting the Shield.

  • Advancing the Shield.

  • “Grouting” the Lining.

  • Rate of Progress.

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