Aspects of Nature Author:Alexander von Humboldt Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ANNOTATIONS AND ADDITIONS. (') p. 226.—"A more complete determination of the height of all parts of the margin of the crater." Oltmanns, my astronomical fe... more »llow labourer, of whom, alas ! science has been early deprived, re-calculated the barometric measurements of Vesuvius referred to in the preceding memoir (of the 22d and 25th of November, and of the 1st of December, 1822), and has compared the results with the measurements which have been communicated to me in manuscript by Lord Minto, Visconti, Monticelli, Brioschi, and Poulett Scrope. A. Rocca del Palo, the highest and northern, margin of the Crater of Vesuvius. Toisea. Eng. ft. Saussure, barometric measurement computed in 1773, probably by Deluc's formula . . . 609 — 3894 Poli, 1794, barometic 606 — 3875 Breislak, 1794, barometric (but, like Poli, the formula employed uncertain) 013 — 3920 Gay-Lussac, Leopold vonBuch,andHumboldt, 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 — 7931Toises. Eng;. ft. 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 w...« less