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Updated: May 4, 2025
Jackson, it's a new kind of monoplane. I never saw one like it before. I wonder who could have invented that? It's something like a Santos-Dumont and a Bleriot, with some features of Cornu's Helicopter. That's a queer machine." "It certainly is," agreed the engineer, who was now sighting through the glasses.
The previously admitted velocity was 308 million metres per second; Foucault reduced it to 298 million. Combined with Struve's "constant of aberration" this gave 8.86" for the solar parallax, which exactly agreed with Cornu's result from a repetition of Fizeau's experiments in 1872. Roy. Astr. Johann Hieronymus Schröter was the Herschel of Germany.
This tells chiefly upon the shortest wave-lengths; the ultra-violet spectrum is in fact closed, as if by the interposition of an opaque screen. Nor does the screen appear very sensibly less opaque from an elevation of 10,000 feet. Dr. Simony's spectral photographs, taken on the Peak of Teneriffe, extended but slightly further up than M. Cornu's, taken in the valley of the Loire.
All belonged presumably to the same substance; and the presumption was rendered a certainty by direct photographs of the hydrogen spectrum taken by H. W. Vogel at Berlin a few months earlier. In them seven of the white-star series of grouped lines were visible; and the full complement of twelve appeared on Cornu's plates in 1886.
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