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Updated: May 1, 2025
In fact, as already explained, every point of the wave which fills the slit is itself a centre of a new wave system which is transmitted in all directions through the ether behind the slit. This is the celebrated principle of Huyghens: we have now to examine how these secondary waves act upon each other. Let us first regard the central band of the series. Let E T represent a portion of the retina.
He himself tells us of the enormous pains that he took to get full and accurate information, collecting records, consulting archives and submitting every portion as it was written to the criticism of living authorities, more especially to Constantine Huyghens and through him to the Prince of Orange himself.
The real improvements which the illustrious Huyghens applied to the ingenious conception of our countryman were far, however, from imparting to it clearness and precision, those characteristic attributes of truth.
At an early age he discovered the principle of isochronism of the pendulum, which, in the hands of Huyghens in the middle of the seventeenth century, led to the invention of the pendulum clock, perhaps the most valuable astronomical instrument ever produced.
With respect to Huyghens, he appears to have formed a conjecture respecting the spheroidal figure of the earth independently of Newton; but his method for computing the ellipticity is founded upon that given in the Principia. Translator.
The same principles enabled him to lay the foundation of the doctrine of probabilities, an important branch of mathematical science, which Huyghens, a few years afterwards, improved, and which the Marquis la Place and M. Poisson have so greatly extended.
The doctrine of an intermolecular and interstellar ether is wrapped up in the well-established undulatory theory of light. Such is by no means the case with Sir William Thomson's vortex-atom theory, which to-day is in somewhat the same condition as the undulatory theory of Huyghens two centuries ago.
This candidate, docile to the voice of his protector, rapidly composed and published the éloges of the early founders of the Academy, of Huyghens, of Mariotte, of Roëmer, &c. At the beginning of 1773, the Perpetual Secretary, Grandjean de Fouchy, requested that Condorcet should be nominated his successor, provided he survived him. D'Alembert strongly supported this candidateship.
It would also be a most pleasant task to follow the evolution of our subject in the new era of investigation ushered in by the invention of that marvelous instrument, the telescope, followed closely by the work of Kepler, Scheiner, Cassini, Huyghens, Newton, Digges, Nonius, Vernier, Hall, Dollond, Herschel, Short, Bird, Ramsden, Troughton, Smeaton, Fraunhofer, and a host of others, each of whom has contributed a noble share in the elimination of sources of error, until to-day we are satisfied only with units of measurement of the most exact and refined nature.
But the little "book of saints" which has just been mentioned says, of a Juffrouw Huyghens, who died in January, 1680, a lady very zealous for the conversion of the Indians, that she said that "if any of us went out thither, she would wish to be one of the first."
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