e observation of the stars. They are servations of 1893 is, in part, that they were made at the very summit of Mont Blanc, and especially my attention to the qualities of the atmospheric situated, besides, at the very origin of atmospheric transparency of this nearly unique station and to the… … An experimental structure having stood upon the that supports the observatory and of manipulating the Fig. 1.- FRAMEWORK OF THE JANSSEN OBSERVATORY jack screws that are capable of restoring verticality to summit of Mont Blanc for a whole winter, Mr. Jans- MOUNTED UPON THE SNOW AT THE SUMMIT OF the…
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