British achievements.

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Select an Inventor Alexander Graham BellAlexander WoodAndrew MeikleC. Albert SmithCharles BabbageCharles Frederick CrossChristopher CockerellDennis GabonEdmund CartwrightEdmund HalleyEdward JennerGeorge StephensonGodfrey N. HounsfieldIsaac NewtonJ.B. DunlopJ.F. DaniellJames HargreavesJames NasmythJames WattJethro TullJohn BarberJohn DollondJohn HarrisonJohn Logie BairdJohn MercerJohn WalkerJoseph AspdinJoseph BramahJoseph ListerKirkpatrick MacMillanMichael FaradayR. ArkwrightRichard TrevithickRoger BaconSamuel HarrisonSir Alexander FlemingSir Charles Algernon ParsonsSir Charles WheatstoneSir Francis William AstonSir Frank WhittleSir Henry BessemerSir Humphry DavySir James DewarSir James MartinSir John Ambrose FlemingSir Joseph Wilson SwanSir Robert Watson-WattSir William Augustus TildenSir William CrookesThomas NewcomenThomas SaveryTrevor BaylisWilhelm SiemensWilliam CongreveWilliam GedWilliam Henry Fox TalbotWilliam K. L. DicksonWilliam MurdockWilliam Sturgeon

J.F. Daniell

John Frederic Daniell was born in London, England, on 12 March 1790

His research in 1820 led to the invention of a dew-point hygrometer that measured relative humidity which afterwards became a standard instrument. His hygrometer was made with two thin glass bulbs that were hung from a base and joined with a glass tube. One of the glass bulbs held ether and a thermometer that collected and dissipated dew when the other bulb was slowly cooled and reheated. The condensing temperature was produced by evaporation of the ether. Daniell's hygrometer, as it was called, enabled the easy determination of vapor that existed in a given mass of atmosphere. The average temperature recorded by the device was the dew point. In 1823, he published Meteorological Essays which soon became a popular book.

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