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UNITED STATES PATENT OFFICE. NIKOLATESLA, OF SMILJAN LIKA, AUSTRIA-HUNGARY, ASSIGNOR TO THE TESLAELECTRIC LIGHT AND MANUFACTURING COMPANY, OF RAHWAY, NEW JERSEY. EECTRC-ARC AVP SPECIFICATION formingpartofLettersPatentNo.335,787,datedFebruary9,1886. ApplicationfiledJuly13,185. SerialNo,171,416. (Nomodel.) Toalwhom itmay concern: suficienttoproducetherequiredmagnetism, BeitknownthatI,NIKOLATESLA,ofSmil besidesagreatersurfaceisoferedforcooling janLika,bordercountryofAustria-Hungary, offthewires. haveinventedcertainImprovementsinElec 5tric-ArcLamps,ofwhichthefollowingisa arecurved,asindicatedinthedrawings,Fig.55 Inanotheraplication,No.160,574,filed together,taperingtowardthearmature(),as Specification. 1.Thelowerpole-pieces,m?n',arebroughtnear bymeMarch30,185,Ihaveshownandde showninFigs.2and4. Theobjectofthis scribedalamphavingtwomagnets,inthe Iomainandshuntcircuits,respectively,anar mature-lever,andfeed-mechanismconnected tothearmature-lever. Mypresentinventionconsistsinsomemodi ficationsofandimprovementsuponthede taperistoconcentratethegreatestamountof thedevelopedmagnetismuponthearmature,6o andalsotoallowthepultobeexertedalways uponthemiddleofthearmatureg. This armaturegisapieceofironintheshapeofa hollowcylinder,havingoneachsideaseg I5vicesshownintheapplicationreferedto. mentcutaway,thewidthofwhichisequalto65 InmypresentinventionIfurtherprovide meansforautomaticallywithdrawingalamp fromthecircuit,orcuttingoutthesame, when,fromafailureofthefed,thearereaches 2Oanabnormallength,andalsomeansforauto maticallyreinsertingsuchlampinthecircuit whentheroddropsandthecarbonscomeinto Contact. Myinventionwilbeunderstoodwithrefer 25encetotheaccompanyingdrawings. Inthedrawings,Figure1isanelevationof thelampwiththecaseinsection. Fig.2isa sectionalplanatthelineaac, Fig.3isan elevation,partlyinsection,ofthelampat thewidthofthepole-piecesinn. Thearmatureissolderedorotherwisefast enedtotheclampr,whichisformedofa brastube,providedwithgripping-jawse, Fig.5. Thesejawsarearcsofacircleofthe7o diameteroftherodR,andaremadeofSome hardmetal,preferablyofhardenedGerman silver. Ialsomaketheguidesff,through whichthecarbon-holdingrodRslides,ofthe same material. Thishastheadvantagetore-75 ducegreatlythewearandcorosionofthe partscominginfrictionalcontactwiththerod, whichfrequentlycausestrouble. Thejawsee arefastenedtotheinsideofthetube ,SO thatoneisalitlelowerthantheother. The 8o 3OrightanglestoFig.1. Fig.4isasectional planattheline/)ofFig.1. Fig.5isasec objectofthisistoprovideagreateropening tionoftheclampinaboutfulsize. IFig.6is forthepassageoftherodwhenthesameis adetachedsectionilustratingtheconnectionreleasedbytheclaimp.Theclamp issup ofthespringtotheleverthatcariesthepiv portedonbearingsv2.0,Figs.1,3and5,which 35otsoftheclamp,andFig.7isadiagram arejustinthemiddlebetweenthejaws(e.i.85 showingthecircuit-connectionsofthelanp. findthisdispositiontobethebest. Thebear Inthedrawings,Fig.1,Mrepresentsthe ingsatcarecariedbyalever,t,oneendof mainandNtheshuntmagnet,bothsecurely whichrestsuponanadjustablesupport,q,of fastenedtothebaseA,which,withitsside thesidecolumns,S,theotherendbeingcon 4ocolumns,SS,ispreferablycastinonepieceof nectedbymeansofthelinke'tothearmature90 brassorotherdiamagneticmaterial. Tothe leverI. Thearmature-leverLisaflatpiece magnetsaresolderedorotherwisefastenedthe ofironin2shape,havingitsendscurvedso brasswashersordisks(acla. Similarwash astocorrespondtotheformoftheupperpole ers,bb,offiberorotherinsulatingmaterial, piecesofthemagnetsMandN. Itishung 45servetoinsulatethewiresfromthebrass uponthepivotsv),Fig.2,whichareinthe95 washes. jawaofthetopplate,B. ThisplateB,with ThemagnetsMandNaremadeveryflat, thejaw,ispreferablycastinonepieceand sothattheirwidthexceedsthreetimestheir screwedtothesidecolumns,SS,thatextend thicknes,orevenmore. Inthiswayacom upfromthebaseA. To partlybalancethe 5oparativelysmalnumberofconvolutionsis overweightofthemovingpartsaspring,8,IOO o The upper pole-pieces, in n, ofthe magnetsPDF Image | Nikola Tesla Electric Arc Lamp 335787
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