| Toises. | Eng. ft. | |
|---|---|---|
| Saussure, barometric measurement computed in 1773, probably by Deluc’s formula | 609 | 3894 |
| Poli, 1794, barometric | 606 | 3875 |
| Breislak, 1794, barometric (but, like Poli, the formula employed uncertain) | 613 | 3920 |
| Gay-Lussac, Leopold von Buch, and Humboldt, 1805, barometric, computed by Laplace’s formula, as are also all the barometric results which follow | 603 | 3856 |
| Brioschi, 1810, trigonometric | 638 | 4080 |
| Visconti, 1816, trigonometric | 622 | 3977 |
| Lord Minto, 1822, barometric, often repeated | 621 | 3971 |
| Poulett Scrope, 1822, barometric, somewhat uncertain from the proportion between the diameters of the tube and cistern being unknown | 604 | 3862 |
| Monticelli and Covelli, 1822 | 624 | 3990 |
| Humboldt, 1822 | 629 | 4022 |
Most probable result 317 toises, or 2027 English feet, above the Hermitage; or 625 toises, or 3996 English feet, above the level of the sea.
B. The lowest and southern margin of the crater opposite to Bosche Tre Case.
| Toises. | Eng. ft. | |
|---|---|---|
| After the eruption of 1794 this edge became 400 (426 Eng.) feet lower than the Rocca del Palo; therefore if we estimate the latter at 625 toises (3996 English feet) | 559 | 3574 |
| Gay-Lussac, Leopold von Buch, and Humboldt, 1805, barometric | 534 | 3414 |
| Humboldt, 1822, barometric | 546 | 3491 |
C. Height of the cone of scoriæ inside the crater, which fell in on the 22d of October, 1822.
| Toises. | Eng. ft. | |
|---|---|---|
| Lord Minto, barometric | 650 | 4156 |
| Brioschi, trigonometric, according to different combinations either | 636 | 4066 |
| Or | 641 | 4098 |
Probable final result for the height of the above-mentioned cone of scoriæ 646 toises, or 4130 English feet.
D. Punta Nasone, highest summit of the Somma.
| Toises. | Eng. ft. | |
|---|---|---|
| Schuckburgh, 1794, barometric, probably computed by his own formula | 584 | 3734 |
| Humboldt, 1822, barometric, Laplace’s formula | 586 | 3747 |
E. Plain of the Atrio del Cavallo.