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Updated: June 5, 2025
The lines D he found to he considerably strengthened by the passage of the solar light through the voltaic arc. Instead of the image of the sun, Foucault then projected upon the arc the image of one of the solid incandescent carbon points, which of itself would give a continuous spectrum; and he found that the lines D were thus generated in that spectrum.
The feeble theatricality of the gesture offended Sophia's taste. She asked sternly what Madame Foucault expected her to do. Had not Madame Foucault knowingly exposed her, without the least warning, to the extreme annoyance of this visit of the law, a visit which meant practically that Sophia was put into the street? "You must not be hard!" Madame Foucault sobbed.
I refer to the speed of light, which appears to us, as we shall see further on, the maximum value of speed which can be given to a material body. After the historical experiments of Fizeau and Foucault, taken up afresh, as we know, partly by Cornu, and partly by Michelson and Newcomb, it remained still possible to increase the precision of the measurements.
"Count Robert," rejoined William, "I shall be so forward in peril to-day, that you will not even come near the tail of my horse." With these words they all set out at full gallop, Robert's old deaf tutor, Sir Foucault de Nesle, who had not heard one word of the remonstrance, holding his bridle, and shouting, "Ores a eux! ores a, eux!"
That makes six hundred and seventy-five. Here are seven hundreds." "I have no change," said Madame Foucault. "I have nothing." "That will pay for the hire of the bath," said Sophia. She laid the notes on the pillow. Madame Foucault looked at them gluttonously, as any other person would have done in her place. She did not touch them. After an instant she burst into wild tears.
An immense crowd in front of the new Opera. They say we shall be at Berlin in a month or at most two months." "Oh!" Sophia muttered. "Why is there a war?" "Ah! It is I who asked that. Nobody knows. It is those Prussians." "Don't you think we ought to begin again with the disinfecting?" Sophia asked anxiously. "I must speak to Madame Foucault."
Some of the upper ones had green sunblinds. Scarcely any sound! Mysteries brooded without as well as within the flat of Madame Foucault. Sophia saw a bodiless hand twitch at a curtain and vanish. She noticed a green bird in a tiny cage on a sill in the next house.
Sophia nodded and smiled, and Madame Foucault also nodded and smiled. But Madame Foucault's face quickly resumed its anxious expression. "The servant's brother marries himself to-day, and she implored me to accord her two days what would you? Madame Laurence is out. And I must go out. It is four o'clock. I shall re-enter at six o'clock striking. Therefore ..." "Perfectly," Sophia concurred.
The experiments of two Frenchmen, Hippolyte L. Fizeau and Leon Foucault, served finally to convince the last lingering sceptics that light is an undulation; and by implication brought heat into the same category, since James David Forbes, the Scotch physicist, had shown in 1837 that radiant heat conforms to the same laws of polarization and double refraction that govern light.
Clothes were hung up in disorder on rough nails; among them she recognized a dressing-gown of Madame Foucault's, and, behind affairs of later date, the dazzling scarlet cloak in which she had first seen Madame Foucault, dilapidated now. So this was Madame Foucault's room! This was the bower from which that elegance emerged, the filth from which had sprung the mature blossom!
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