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This app gives you all the unique moments of exploring - game before
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This app gives you all the unique moments of exploring - game before
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This app gives you all the unique moments of exploring - game before
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While an impulse was thus given to the mathematical theory of light in the University of Cambridge, similar progress was being made in the sister University of Dublin, where three of her most eminent professorsSir William Rowan Hamilton, Dr. Lloyd, and Mr. M'Cullaghdevoted themselves energetically to its improvement and verification. Sir William Hamilton, a geometer of the first order, having undertaken a more complete discussion of the wave surface of Fresnel, to the equation of which he gave a more elegant form, ascertained the exact nature of that surface, and consequently the exact direction of refracted rays in the neighbourhood of the optic axes. The beautiful and unexpected results he obtained were verified by his friend Dr. Lloyd. The names of Sir William R. Hamilton and Dr. Lloyd will be handed down to posterity in connection with this discovery. "But," says Professor Forbes, "they have other claims to our respect. The former has generalised the most complicated cases of common geometrical optics, by a peculiar analysis developed in his essays on 'Systems of Rays.' To Dr. Lloyd we are indebted for several interesting experimental papers on optics, for an impartial review of the progress of the science, and for an excellent elementary treatise on the wave theory."There were various actions at sea, in one quarter or other. Sir Hyde Parker, convoying a merchant fleet from the Baltic, on the 5th of August fell in with Admiral Zouttman near the Dogger Bank, also convoying a fleet of Dutch traders. An engagement took place, Zouttman having a few men-of-war more than Parker. The engagement was terrible. The ships on both sides were severely damaged, and the Hollandiaa sixty-four-gun ship of Zouttman'swent down with all its crew. Many of the other ships were with difficulty kept afloat. On reaching the Nore, the king and the Prince of Wales went on board, where they highly complimented both Parker and the rest of the officers. On the 12th of December Admiral Kempenfeldt, with thirteen ships-of-the-line, discovered, off Ushant, the French fleet, under De Guichen, convoying a fleet of transports and merchantmen, bound, some for the East and others for the West Indies, with troops and stores. The fleet of De Guichen was far superior to that of Kempenfeldt, but, the convoy being at a considerable distance from the transports and traders, Kempenfeldt adroitly made himself master of twenty sail of these vessels, and sailed off with them; and within a few days afterwards he[286] captured five more of these ships. There were also other fights of minor importance.