用英文介绍爱迪生的一项发明(详细)
用英文介绍爱迪生的一项发明(详细)
用英文介绍爱迪生的一项发明(详细)
用英文介绍爱迪生的一项发明(详细)
Phonograph-History
ThefirstgreatinventiondevelopedbyEdisoninMenloParkwasthetinfoilphonograph.Whileworkingtoimprovetheefficiencyofatelegraphtransmitter,henotedthatthetapeofthemachinegaveoffanoiseresemblingspokenwordswhenplayedatahighspeed.Thiscausedhimtowonderifhecouldrecordatelephonemessage.Hebeganexperimentingwiththediaphragmofatelephonereceiverbyattachinganeedletoit.Hereasonedthattheneedlecouldprickpapertapetorecordamessage.Hisexperimentsledhimtotryastylusonatinfoilcylinder,which,tohisgreatsurprise,playedbacktheshortmessageherecorded,"Maryhadalittlelamb."
ThewordphonographwasthetradenameforEdison'sdevice,whichplayedcylindersratherthandiscs.Themachinehadtwoneedles:oneforrecordingandoneforplayback.Whenyouspokeintothemouthpiece,thesoundvibrationsofyourvoicewouldbeindentedontothecylinderbytherecordingneedle.ThiscylinderphonographwasthefirstmachinethatcouldrecordandreproducesoundcreatedasensationandbroughtEdisoninternationalfame.
August12,1877,isthedatepopularlygivenforEdison'scompletionofthemodelforthefirstphonograph.Itismorelikely,however,thatworkonthemodelwasnotfinisheduntilNovemberorDecemberofthatyear,sincehedidnotfileforthepatentuntilDecember24,1877.Hetouredthecountrywiththetinfoilphonograph,andwasinvitedtotheWhiteHousetodemonstrateittoPresidentRutherfordB.HayesinApril1878.
In1878,ThomasEdisonestablishedtheEdisonSpeakingPhonographCompanytosellthenewmachine.Hesuggestedotherusesforthephonograph,suchas:letterwritinganddictation,phonographicbooksforblindpeople,afamilyrecord(recordingfamilymembersintheirownvoices),musicboxesandtoys,clocksthatannouncethetime,andaconnectionwiththetelephonesocommunicationscouldberecorded.
留声机:)
请给我吧:)
这里有很多呢:)