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Updated: May 5, 2025
Ottumwa, Ia. By RICHARD A. PROCTOR. Science owes to M. Foucault the suggestion that the motions of a pendulum so suspended as to be free to swing in any vertical plane might be made to give ocular demonstration of the earth's rotation.
But I must go now." Madame Foucault continued to recite her woes, chiefly financial, in a weak voice damp with tears; she also continued to apologize for mentioning herself. She had finished sobbing, and lay looking at the wall, away from Sophia, who stood irresolute near the bed, ashamed for her companion's weakness and incapacity.
Sophia felt the nearness of the idea and she wanted to be shocked at the notion of any avowed association between herself and Madame Foucault; but she could not be. "Here are a lady and a gentleman who want a bedroom," began Madame Foucault, "a nice large bedroom, furnished." "Oh!" said Sophia; "who are they?"
In the harsh vanity of her conscious capableness and young strength she thought thus, half forgetting her own follies, and half excusing them on the ground of inexperience. Sophia wanted to go round the flat and destroy every crimson lampshade in it. She wanted to shake Madame Foucault into self- respect and sagacity. Moral reprehension, though present in her mind, was only faint.
Still later, Leverrier made it 91,759,000. Airy and Stone, by another method, made it 91,400,000; Stone alone, by a revision of the old observations, 91,730,000; and finally, Foucault and Fizeau, from physical experiments, determining the velocity of light, and therefore in their nature altogether differing from transit observations, 91,400,000.
The velocity of light is 186,000 miles a second; whence the distance to the sun is 92,780,000 miles. There seems, however, to be some uncertainty about the true value of the aberration, any determination of which is subject to irregularities due to the "seasonal errors." The velocity of light was experimentally found, in 1862, by Fizeau and Foucault, each using an independent method.
The conditions upon which the working of a well conceived dynamo machine must depend were next alluded to, and it was demonstrated that when losses by unnecessary wire resistance, by Foucault currents, and by induced currents in the rotating armature were avoided, as much as 90 per cent., or even more, of the power communicated to the machine was realized in the form of electric energy, and that vice versa the reconversion of electric into mechanical energy could be accomplished with similarly small loss.
Wheatstone's device of the revolving mirror was afterwards employed by Foucault and Fizeau to measure the velocity of light. In 1835, at the Dublin meeting of the British Association, Wheatstone showed that when metals were volatilised in the electric spark, their light, examined through a prism, revealed certain rays which were characteristic of them.
She had actually witnessed nothing; but since the beginning of her convalescence her ears had heard, and she could piece the evidences together. There was never any sound in the flat, outside the kitchen, until noon. Then vague noises and smells would commence. And about one o'clock Madame Foucault, disarrayed, would come to inquire if the servant had attended to the needs of the invalid.
Natheless the Prior of Lagny, within that very week wherein we came, had gone to St. Denis, and yielded his good town into the hands of the Duc d'Alencon for the King. And the fair Duke had sent thither Messire Ambrose de Lore, a very good knight, with Messire Jehan Foucault, and many men-at-arms. To Messire Ambrose we were brought, that we might give and take his news.
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