Peter Barlow (mathematician)
In collaboration (1827–1832) with optician George Dollond, Barlow built an achromatic lens that utilized liquid carbon disulfide.[1][3] A derivative of this design, named a Barlow lens, is widely used in modern astronomy and photography as an optical element to increase both achromatism and magnification.Two years later, he received its Copley Medal for his work on correcting the deviation in ship compasses caused by the presence of iron in the hull.A decade passed between Ampère's paper being read at the Paris Academy of Sciences and William Ritchie building the first demonstration electromagnetic telegraph.In Barlow's defence, Ampère's design did not enclose the compass in a multiplying coil, as Ritchie's demonstrator did, so the effect would have been very weak at a distance.
NorwichCharlton, LondonBarlow lensBarlow's wheelBarlow's formulaCopley MedalMathematicsphysicsengineeringmathematicianphysicistRoyal Military Academy, WoolwichThe Ladies' DiaryRees's CyclopædiaEncyclopædia MetropolitanaGeorge Dollondachromatic lenscarbon disulfideAchromatic lensesoptical elementstelescopesdoublet lensflint glasscrown glassastronomyphotographyRoyal SocietycompassesSamuel Hunter Christieterrestrial magnetismhomopolarelectric motorBarlow's lawAndré-Marie Ampèreelectromagnetic telegraphParis Academy of SciencesWilliam RitchieSteam locomotionRailway Inspectoratestrength of materialsPeter W. BarlowWilliam Henry Barlowcivil engineersAmerican Academy of Arts and SciencesCharlton Cemetery2147483647Mersenne primeWikisource1911 Encyclopædia BritannicaCopley MedallistsAstley CooperWilliam Hyde WollastonRichard ChenevixSmithson TennantHumphry DavyThomas Andrew KnightEverard HomeWilliam HenryEdward TroughtonBenjamin Collins BrodieWilliam Thomas BrandeJames IvoryDavid BrewsterHenry KaterRobert SeppingsHans Christian ØrstedEdward SabineJohn HerschelWilliam BucklandJohn PondJohn BrinkleyFrançois AragoJames SouthWilliam ProutHenry FosterGeorge Biddell AiryMichael FaradaySiméon Denis PoissonGiovanni PlanaWilliam Snow HarrisJöns Jacob BerzeliusFrancis KiernanAntoine César BecquerelJohn Frederic DaniellCarl Friedrich GaussRobert BrownJustus von LiebigJacques Charles François SturmGeorg OhmJames MacCullaghJean-Baptiste DumasCarlo MatteucciTheodor SchwannUrbain Le VerrierJohn Couch AdamsRoderick MurchisonPeter Andreas Hansen