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LIST OF ILLUSTRATIONS.
| View of Portskewett Pier, with the Tunnel Works in the distance | 66 |
| Plan of Methods of Timbering Headings | 80 |
| „„‘Breaking up’ from the Heading | 82 |
| „„Break-up Length with Centres | 84 |
| „„Timbering for Tunnel in Soft Ground | 86 |
| Section showing Method of Sinking 29-foot Shaft and Curbs | 88 |
| View of Sir John Hawkshaw inspecting the Works, and at Work in the Tunnel | 102 |
| Plan of the Infirmary at Sudbrook | 106 |
| „„the New Mission Hall, Sudbrook | 108 |
| View of Sudbrook | 118 |
| Plan of Sudbrook in 1882 | 118 |
| „„Cavity, Headwall, and all Headings near the ‘Big Spring’ | 124 |
| View of the Temporary Engine-Houses at Sudbrook | 130 |
| „„the Permanent Engine-Houses at Sudbrook | 130 |
| „„Men in Boat sawing the Timber | 132 |
| „„Flooded Cutting | 134 |
| Plan of the Temporary Pumping-Engines for the Great Spring and Pumps in the Tunnel | 138 |
| Elevation of Temporary Engine-Houses for the Great Spring | 140 |
| View of the Fever Hospital at Sudbrook | 142 |
| Plan of the Fever Hospital at Sudbrook | 142 |
| „„Side-Heading to the Great Spring | 146 |
| „„Fissure and all Headings at Great Spring | 148 |
| „„Sudbrook in 1884 | 150 |
| Progress Sections for the Years 1881-4 | 151 |
