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UNITEDSTATESPATENT ofFICE. NIxor,A TESLA, OF NEw York, N.Y., ASSIGNOR. To watt HARI waTCH COMPANY, OF wALTHAM, MASSACEUSETTS, A CORPORATION OF MASSACHUSETTS, FREQUENCYMETER. 1402,025. SpecificationofLetersPatent, PateratedJan.3,1922. AplicationfiledDecember18,1916. SerialNo.137,689. Toalwhomitmayconcern: - BeitknownthatI,NIKoLATESLA,acitia. initsbroaderaspectstomatersofde 55 zenoftheUnitedStates,residingatNew 5representsdiagrammaticallyatwo-phase York,inthecountyandStateofNewYork, generator,typifyingthemachinecontroling haveinventedcertainnewandusefulIm thefrequencytobemeasured,andhaving provementsinFrequencyMeters,ofwhich suitableconectionbywires6withthesyn60 thefollowingisaful,clear,andexactde chronous-motorelementofthefrequency scription. meter,indicatedasawholeby7. Themotor, Inmanyinstancesinpracticeitis,very 8,wilofcoursehavefieldpolesandarma desirableandimportanttoascertainthefre turebarsappropriatetothecharacterofthe quencyofperiodiccurentsorelectricoscil currentsuppliedfromthegenerator5,the65 10 5 20 25 30 35 40 ofbras,say,havingannularspaced,con Fig.2isanendview; centricwalls31,and asitssecondaryele Fig. 3 is a side elevation with the cover in ment, 32, a pivoted part including very 45 section,andFig.4isasideelevationofthelight,annularwals33interleavedwiththe instrumentfromitsreadingside. walls31andafordingextensivesmoothfric100 Itwilbeunderstoodthatthespecificcon tionsurfaces,verycloselyadjacentto,but structionofinstrumentsembodyingmyin notcontactingwith,thekindredsurfacesof ventionmaybemodifiedinmanywaysac theprimarymembersothatthroughthe 50. cordingtothedemandsoftheelectricalor thinfilmsoffluid,preferablyair,interven mechanicalenvironmentinwhichitistobe ingbetweenthem,torquemaybetransmit105 used,andwhileIshaldescribeindetaila tedfromtheprimarytothesecondaryele specificconstruction,ilustratedinthedraw mentinsubstantialylinearproportionto ing,itiswithoutintenttolimitmyinven thespedoftheprimary. Posts35,mounted lationsandtherefromthespedofrotation motorbeingofthesplit-phase,two-phase, orreciprocationofthegeneratingorcon orothertype,asneded. A frame10,hav trollingapparatus. inglugs1,orothermeansofsupport,pro Thedevicescommonlyusedatpresentfor videsacup-formedshel12withatopwall thispurposeanddesignated"frequencyme. 13furnishedwithacentralbearingtube14 70 ters'generalyconsistofredsorbarstuned andwithsuitablesupportingmeans,as15, to respond to impulses of definite periods, forthestationaryfieldstructure16. A cap1, oradirectcurentdynamocoupledtothe screwthreadedat18,andsuitablypacked, alternatinggeneratororfrequencycontrolerhermeticalysealsonesideofthemotorcas: andconnectedwithaninstrument,ofvolt ingintowhichtheconectingwiresareled75 meter construction, graduated to indicate through any suitable sealing and insulating theinstantaneousfrequencyofthecurent. bushings19. Bothoftheseformsareobjectionablefrom Foraccuracyandpromptnessofresponse manypointsofview,beingsubjecttovari tofrequency-variations,thearmaturestruc ouslimitationsofpracticalavailabilityand ture21,asawhole,withitsatachments80 todisturbinginfluences,alsowelknownto should be of very light weight and so expertsastodispensewiththenecesityof equipedthatitsworkisminimized. Hence enlarginguponthemonthisocasion. itisimportantboththattheconstructionof Myinventionhasforitsobjecttoprovidethearmatureelementbedesignedwithref afrequencymeterofgreatacuracy,struc erencetosmalnesandconsequentlightnes85 turalsimplicity,widerangeofuse,andlow ofparts,andthatitsfrequency-indicating cost,aladequatetomeetthepresingde equipmentbeofacharacterimposingthe mandforacommercialandscientificalysat lightestloadonthearmature. Specificaly, isfactoryinstrumentofimproyedform, thearmaturelaminae22arecarriedona Inthedrawings,wherein.Ihaveilus lightdisk23,fixedtotheverticalshaft24,90 tratedasingleembodimentofmyinvention thatissupportedbybalbearings25and26, forpurposesofdisclosure - intube14,and,abovethewal13,caries Fig.1isacentralverticalsectionthrough thedrivingmemberoftheindicatordevice thefrequencymeter,withdiagrammaticex 28. Thisapliancecomprises,asitspri tension to indicate an available manner of mary element, 29, a non-magnetic disk 30, connectingittoatwo-phasegenerator;PDF Image | Nikola Tesla Frequncy Meter 1402025
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