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1402,025 inthetopwaloftheframe,suport,a vision. Thesmalsize,lowcostandeaseof bridgepiece36thatcariesabearingyoke maintenance,duetothesimplicityofthe 37,affordingupperandlowerjewelbear constructionareespecialydesirable. rigidly, the arm 43 carrying the annular nected to the armature shaft, and a pivoted wallsofthesecondaryelement. A spiraltorsionaly-restrainedsecondaryelement,de O spring4,fixedatoneendtotheshaft42 flectableinsubstantialylinearproportion75 and at its other end clamped adjustably in to the speed of the primary and calibrated thesplitstud45onbracket37,permitsro intermsofelectricalfrequency. tarydisplacementofthesecondaryelement, 2.Inafrequencymeter,thecombination substantialy in linear proportion to the ofasynchronousmotorandaspeed-respon 15 forceaplied. A scale48,printedonorsivedevice,saidmotorhavinganarmature80 otherwise affixed to the outermost wall of oflightconstructionandsaidspeed-respon the secondary element, is graduated in units sive device comprising a primary element offrequencyanditsindicationpointisde cariedinrotationbysaidarmature,anda terminedbyafixedpointer49thatisfixed torsionaly-restrained secondary element, 20 attheedgeofatransparentsealedwindow theseelementshavingextensiveconfront85 50ofthecasingshel51ofcupformation,ing,closelyadjacentfrictionsurfaces,co thatissecuredinsealedrelationtothewall operatingthroughinterposedfilmsofafluid 18asbypackedscrews52engagingboses mediumfordisplacementofsaidsecondary 58onthebridgepiece36sotocompletethe elementinsubstantialylinearproportionto 25 hermeticenclosureofthechambercontain thespeedofrotationoftheprimaryelement.90 ingtheindicatingelements.Suchherihetic 3.Inafrequencymeter,thecombination closureisnotnecesaryinmanyinstancesofasynchronousmotorandaspeed-respon butmaybedesirable. sivedevice,theformerhavin anarmature Inmy copendingaplicationSerialNo. oflightconstructionandthelatercompris 30 841,726filedMay29th,1914,PatentNo.ingaprimaryelement,cariedinrotation 1209,859Ihavesetforthindetailcertain by said armature, and a torsionaly-re lawstheobservanceofwhichresultsinat strainedsecondaryelement,theseelements tainmentofrigorousproportionalityofde havingextensiveconfronting,closelyadja flectionstospedinan“airdrag instru centfrictionsurfaces,cooperatingthrough 35 ment,andalofsuchconditionsmaybeob interposedfilmsofairfordisplacementof100 servedtoadvantageinconstructingthein said secondary element in substantialy dication-giving element of the frequency linear proportion to the speed of rotation of meter. theprimaryelement,saidsecondarybearing It.wilbenotedthataninstrumentasascalecalibratedintermsoffrequency. 40 herein.describedhasmanystructuraland 4.Afrequencymetercomprising,incom105 operative advantages. The translating in bination, a synchronous induction motor, strument, giving the frequency-reading, havingashelcarryingthefield,andarota. whenconstructedforuseofairasthetrans table armature within the chamber of said mitingmedium,maybeofsizetogiveam shelhavingitsshaftextendedthroughsaid 45 pletorque,butifdesiredtheensealedmech shel;andaspeed-responsivedevice,com 10 anismmaybeoperatedinairorother,pref prisingaclosedcasing,anon-magneticpri out special compensating mechanism, and is cent non-contacting surfaces, co-operating thereforepracticalyinsensibletotheheat throughinterposedfilmsofafluidmedium ingefectofthesubjacentmotor,andthe throughwhichtorqueistransmittedtothe double-chamber construction segregatingthe secondary in approximately linear propor 55 motorandtranslatingdevicepreventsthetiontothespeedoftheprimarymember,120 laterfrom beingafectedby air-curents andavisiblescaleuniformlygraduatedin engenderedbythemotor-operation. Fur termsoffrequencycariedbythesecond thermore, the indicator structure may be ary member. - madeimmunetomagneticinfluenceand 5.Afrequencymetercomprisingasealed, 60 eddycurents,howeverintense,bymaking air-containingcasingdividedintotwocom 125 itssecondaryelementofapropriatenon partments,ashaftextendingintobothcom shrinkable, insulating material, as com partments,asynchronousmotorinonecom presed fiber,although in many instances partmentadaptedtodrivesaidshaftandan- thepartition.13,actingasashieldfortheindicatingdeviceintheother,saiddevice 65 indicatorobviatesthenecesityforsuchpro havingaprimaryrotatableelementcon 30 ings38and39,theformercontainedina bushing40threadedforadjustmentinthe yokeandsetbyanut41,suchbearingsre ofasynchronousmotor,andaspeed-respon ceiving the spindle 42 from which extends, sive device, having a primary element con erablyinert,gasesofmorethanatmospheric maryelementmounteduponsaidarmature density for increase of the torque. The air shaft, a separately mounted secondary ele draginstrumentissubstantialyunafected ment pivoted and torsionaly restrained, 50 inacuracybytemperaturechanges,withsaidelementshavingopposed,closelyadja 5 What I claim is: 1.Inafrequencymeter,thecombination70 95PDF Image | Nikola Tesla Frequncy Meter 1402025
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