Principal Dimensions of Fortifications,
according to Vauban.
Dimensions of Walls and their Counterforts, from
10 to 50 Feet high, having a Slope of ⅕ their Height.
| Wall. | Counterforts. | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Height. | Thickness at Top. | Thickness at Bottom. | Distance between them. | Breadth. | Length. | ||||
| Feet. | Feet. | Inch. | Feet. | Inch. | Feet. | Feet. | Inch. | Feet. | Inch. |
| 10 | 4 | 0 | 6 | 0 | 8 | 2 | 8 | 4 | — |
| 15 | 4 | 3 | 7 | 3 | 10 | 3 | 4 | 5 | — |
| 20 | 4 | 6 | 8 | 6 | 12 | 4 | 0 | 6 | — |
| 25 | 4 | 9 | 9 | 9 | 14 | 4 | 8 | 7 | — |
| 30 | 5 | 0 | 11 | 0 | 16 | 5 | 4 | 8 | — |
| 35 | 5 | 3 | 12 | 3 | 18 | 6 | 0 | 9 | — |
| 40 | 5 | 6 | 13 | 6 | 20 | 6 | 8 | 10 | — |
| 45 | 5 | 9 | 14 | 9 | 22 | 7 | 14 | 11 | — |
| 50 | 6 | 0 | 16 | 0 | 24 | 8 | 0 | 12 | — |
The heights in the above table are taken only from the bottom of the ditch, and do not include the foundations.
When the rampart is partly walled and partly turfed; then ⅕ of the height of the turfed part must be added to the breadth of the wall at the top given in the table.
The bases of all inward slopes of earth should be equal to their height, if not more.
The bases of all outward slopes of earth ⅔ of their height.
The superior slopes of all parapets ⅙ of their breadth.
The slope of all walls, or revetement ⅕ of their height.