Polymaths

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April 10, 2026

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April 10, 2026

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"As early as 1793, when he was only twenty, Young had begun to communicate papers to the of London, which were adjudged worthy to be printed in full in the Philosophical Transactions; so it is not strange that he should have been asked to deliver the before that learned body the very first year after he came to London. The lecture was delivered November 12, 1801. Its subject was "The Theory of Light and Colors," and its reading marks an epoch in physical science; for here for the first time was brought forward convincing proof of that undulatory theory of light... which holds that light is not a corporeal entity, but a mere pulsation in the substance of an all-pervading ether, just as sound is a pulsation in the air, or in liquids or solids. Young had... advocated this theory at an earlier date, but it was not until 1801 that he hit upon the idea which enabled him to bring it to anything approaching a demonstration. It was while pondering over the familiar but puzzling phenomena of colored rings into which white light is broken when reflected from thin films—...—that an explanation occurred to him which at once put the entire undulatory theory on a new footing. With that sagacity of insight which we call genius, he saw of a sudden that the phenomena could be explained by supposing that when rays of light fall on a thin glass part of the rays being reflected from the upper surface other rays reflected from the lower surface might be so retarded in their course through the glass that the two sets would interfere... By following up this clew with mathematical precision, measuring the exact thickness of the plate and the space between the different rings of color, Young was able to show mathematically what must be the length of pulsation for each of the different colors of the spectrum. He estimated that the undulations of red light... must number about 37,640 to the inch, and pass any given spot at a rate of 463 millions of millions of undulations in a second, while the extreme violet numbers 59,750 undulations to the inch or 735 millions of millions to the second."

- Thomas Young (scientist)

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"The next publication by Young on his theory of color... a paper read by him before the , on July 1, 1802... "An account of some cases of the production of colours, not hitherto described." ... Young changed his three elementary color-sensations from red, yellow, and blue, to red, green, and violet, in consequence of Dr. Wollaston's correction of the description of the prismatic spectrum." ... Wollaston... only observed imperfectly the dark lines of the spectrum, now known as Fraunhofer's lines, but he imagined he saw a spectrum... divided into four distinct and separated "primary divisions." He at once inferred and erroneously that Newton's analysis... was false; that no orange or yellow exists... but between the red and the blue there exists only a "yellowish green." ...Young made a similar but even greater error in his description... I imagine that when Wollaston's sharp eye caught the glimpse of the divided spectrum he naturally thought... that the dark lines were the dividing lines of the pure simple colors of the solar spectrum. ... Young in finally selecting red, green and violet as the three elementary color-sensations was not, as Helmholtz states, guided in their choice "by the consideration that the extreme colors of the spectrum occupied the privileged positions," but selected those colors on hearing of Wollaston's supposed complete analysis of the sun's light into red, greenish blue and violet colors, separated from each other in the spectrum by dark spaces."

- Thomas Young (scientist)

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"We propose... to call the attention of our readers to some of the more remarkable Memoirs, or Philosophical Essays, of Dr. Young, which have not elsewhere been noticed; selecting those which are distinguished... or which are otherwise calculated to show the extraordinary capacity which he possessed of solving the most difficult problems in the applications of mathematics to natural philosophy, by processes apparently the most inadequate to the purpose. He never confined himself to the beaten track of a systematic investigation. We find in his writings no symmetrical formula or analytical refinements. There is no seeking after generalities, when the particular question which he has in hand does not require them; whilst every expedient is freely resorted to, however irregular and unusual, if it serves the purpose which he has in view. Important and difficult steps are passed over as manifest, terms are neglected as insignificant, analogies take the place of proofs, and we are surprised to find ourselves at the end of an investigation, even within the limits of space which would commonly be deemed hardly sufficient to master the difficulties which meet us at the beginning. But his rare sagacity hardly ever deserts him; and though he has occasionally been led to hasty and premature conclusions, or committed mistakes in numerical calculations, from the brevity and rapidity of his processes, yet nothing can be more surprising than the general soundness of his views of mechanical principles and their applications, and the correctness both of his philosophical and numerical results."

- Thomas Young (scientist)

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"The first publication by Young of his theory of color appeared in a entitled, "On the Theory of Light and Colors," which Young read before the Royal Society on Nov. 12 1801. ... The fact that Young, the founder of the undulatory theory of light, in this Bakerian Lecture, in which it has been said that he laid the foundations of that doctrine, should set forth his views in a series of postulates followed by citations from the writings of Newton, to give them weight and proof, may justly surprise those who have trusted to the second-hand information derived from carelessly-complied text books and from hastily prepared popular lectures. But then, where would be the pugilistic charm of the popular lecturer on the undulatory theory of light, if Newton, his champion, the violent defender of the emanation cause, should decline to enter as a contestant? ... Young's hypothesis imagines each sensitive point of the retina to contain particles capable of vibrating in perfect unison to those vibrations causing three principal colors (red, yellow, and blue, in this the first publication of his hypothesis) "and that each of the particles is capable of being put in motion, less or more forcibly, by undulations differing less or more from a perfect unison." This would suppose such a triple molecular constitution of each nerve fibril as to cause the three species of its constituent molecules (or the atoms forming the molecules) to be in tune with the three rates of vibration corresponding respectively to the undulations of the ether causing red, yellow, and blue. He afterward says: "and each sensitive filament of the nerve may consist of three portions, one for each principal color." We have here a conception of the mode of action of an ætherial vibration on the retinal nerve fibrils which has not been described by those who have given accounts of Young's theory of color. ...the statements made by Young in the foregoing paper concerning his color hypothesis were entirely hypothetical not having been based on any observation or experiment either of his own or of others..."

- Thomas Young (scientist)

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