OCR Text |
Show ANNOTATIONS AND ADDITIONS. 395 ANNOTATIONS AND ADDITIONS. (1) p. 384.-" A more complete determination of the height of all parts of the ma1·gin of the crater." Oltmanns, my astronomical fellow-laborer, 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 highe:Jt and Northern Margin of the Crater of Vesuvius. Toises. Saussure, barometric measurement computed in 1773, pro-bably by Deluc's formula - 609 Poll, 1794, barometric - 606 Breislak, 1794, barometric (but, like Poll, the formula em-ployed uncertain) - 613 Gay-Lussac, Leopold von Buch, and Humboldt, 1805, barometric computed by Laplace's formula, as are also all the barometric results which follow - 603 Brioschi, 1810, trigonometric - - 638 Visconti, 1816, trigonometric - - 622 Lord Minto, 1822, barometric, often repeated - - 621 Poulett Scrope, 1822, barometric, somewhat uncertain, from the proportion between the diameters of the tube and Eng. ft. 3894 3875 3920 3856 4080 3977 3971 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. |