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YOUNG (Thomas) The Bakerian Lecture: Experiments and Calculations Relative to Physical Optics, pp.1-16,
- outer margins slightly browned, but a good large copy. Presented within the complete volume of the Philosophical Transactions of the Royal Society, Vol 93. * "Young was the last of the natural philosophers who could know all that there was to be known. He perfected the wave theory of light, he expounded the mechanism of vision, stated the laws of blood circulation, introduced the modern conceptions of 'energy' and 'work done', evolved a sound theory of tides, and helped to decipher the hieroglyphics of the Rosetta Stone. In his Bakerian Lecture, November 1803, he based himself firmly on the theory that 'radiant light consists of undulations of the luminous ether': a theory that held the field until the latter-day notions of Planck and J. J. Thomson" (Printing and the Mind of Man). * First appearance of this groundbreaking paper giving the first convincing evidence that the fringes are produced by interference of light waves, and giving the experimental demonstrations of the general law of Interference. This important demonstration served as the experimental basis for the wave hypothesis of light. Young also shows in this paper that diffraction effects can be explained by the interference law. * "The experimental basis for the wave hypothesis of light as Young formulated it was interference. The fact has already been observed that two trains of water waves may be so superposed that in certain regions the troughs of one train will lie continuously on the crests of another, thereby producing zero disturbance. Destructive interference is said to occur between the two trains of waves in the former case and constructive interference in the latter. Similarly, two sound waves may be so combined as to produce alternate regions of silence and enhanced sound. The phenomenon of interference, of which the forgoing are familiar examples, is easily comprehensible in the case of combining waves, but would be utterly incomprehensible in the case of combining streams of particles. So when Young demonstrated in 1803 [in the present paper] that two beams of light could, under properly controlled conditions be made to combine in such a way as to produce alternate regions of darkness and light, he was rightly considered to have identified in light a characteristic property of waves." (Lloyd Taylor in: Physics. The Pioneer Science. p. 511). Presented within the complete volume of the Philosophical Transactions of the Royal Society, Vol 93, Parts I and II (complete), bound in one volume for 1804, comprising, iv, 514pp tall quarto, with 8 [of 9?] extending or folding engraved plates, [no plate 6 but not apparently called for in the text] late 19thC library cloth (front hinge worn) with a neat unlinked library name stamp on general title and foot of last leaves, also an inked library stamp verso title, pp.iii-iv with crude early repair to inner margin, margins slightly browned but a good large copy, London, Bulmer, sold by Nicol, printers to the Royal Society,1803. * A FULL LIST OF CONTENTS OF THIS VOLUME SENT ON REQUEST. Other papers include: RUMFORD (Benjamin, Count) An Enquiry concerning the Nature of Heat, and the Mode of Its Communication, pp. 77-182; HERSCHEL (William) Continuation of an Account of the Changes That Have Happened in the Relative Situation of Double Stars, pp.353-384; HATCHETT (Charles) Observations on the Change of Some of the Proximate Principles of Vegetables into Bitumen; With Analytical Experiments on a Peculiar Substance Which is Found with the Bovey Coal, pp.385-410.
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