HE 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 structure in case of an inclination. The observa- sen decided to pursue his work. He constructed at MONT BLANC. tory will be… … of the whole, produced a deep impression. It may be tant edifice. The learned astronomer had assured himself by numerous experiments that there was asked how it could have been carried up to and built to that of the two preceding ascensions. The first, at such an altitude, and especially how one…
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