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Updated: May 9, 2025
The hypsometric work is based upon the railroad levels of the country. Throughout the greater part of the country, there is a system of railroad lines, constituting a net-work.
Hevelius singularly reduced these figures, which Riccioli, on the contrary, doubled. All these measures were exaggerated. Herschel, with his more perfect instruments, approached nearer the hypsometric truth. But it must be finally sought in the accounts of modern observers. Messrs. Boeer and Moedler, the most perfect selenographers in the whole world, have measured 1,095 lunar mountains.
We crossed this disagreeable and uncanny region as quickly as was compatible with the great care we had to exercise, for during the whole time we were thinking of the unwelcome possibility of sinking through. On December 6th we reached our highest point according to hypsometric measurement 11,024 feet above sea level.
From such a hypsometric basis the reliefs for the whole country are determined, by running lines of levels, by trigonometric construction, and in mountainous regions by barometric observation. The primary triangulation having been made, the topography is executed by a variety of methods, adapted to the peculiar conditions found in various portions of the country.
In the meantime the mountains recognised by Barbicane stood out more and more from the dark mass. They were Mounts Doerfel and Leibnitz, which stand on the southern circumpolar region of the moon. All the mountains of the visible hemisphere have been measured with perfect exactitude. This perfection will, no doubt, seem astonishing, and yet the hypsometric methods are rigorous.
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