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1、compassThecompasswasintheearthsmagneticfieldusingmagnetsmadethenorth-southreferstopolarity(对立)apointtoinstrument.Whatiscompass?compassThewarringstatesperiodTheSongdynastyTheMingdynastyMain TimelineNowadayspolarity SiNaEarlyinthewarringstatesperiod,usingmagnetstoinventtheguidebookinstrument-polarityS
2、iNa.guide fish Throughlong-termpracticeandtrialanderror,northernpeoplediscoveredtheartificially(人为地)magnetizationmethod,andtherebymadeguidefishandacompass.Zheng HesexpeditionsEspeciallyduringtheMingDynasty,ZhengHemadeexpeditionstoSouth-eastAsiaforseventimes,whichcontributestotheextensionanddevelopme
3、ntofseafaringandforeigntradeintheworld.SimplecompassMarxhadputacompassandprinting,theinventionofgunpowderiscalled“isbourgeois（资产阶级）developmentnecessarypremise.ComplexcompassNowGPShasalsobeenshowntobeanimportantciviliancommunitiesofinterest,andincreasinglywiderangeofapplication.functionfunctionDirectionFengshuiI n f l u e n c eI n f l u e n c e sailsailcultureculturecapitalismcapitalismOur country is the first state of polarity of the magnet refers to find.The invention of the compass to the world of the Chinese nation,is a great contributions to civilization.