Phenomena of Alternating Currents of Very High Frequency

Nikola Tesla
1891 Scientific American  
the top of the !lpheres, begins again at the bot rom. and pensive vacuum pump i! IIgpted up by being near .to so on. This �oes on so fast t. hat severaleerrated bands the coil or touched with a wlre connel'ted to one öf thtl are seen at once. One lIJa� be puzzled for a few min-tertllinals, the cU1'rent should be leH on no more thlttl utes, but the explanation 111 simple �nöugh. 'l'he di!!-It few moments. else the "lass will he cräcked hy tlle charge beglns at the nearest poInte. the air is
more » ... te. the air is heäted helttlng ofthe rlitefted /tas in öneofthenärröw pässllges and carries the are upward until it breaks. when It is �tn the wl'iter's own experience I}uod erat rlemonstmn-ELKCTRlcALjournals aregetting to bp moreand more I re-establh;b.e,1 a� the nearest points, etc. Sincethetliil'-da�;* . . . . . illteresting. N ew facts are observed and new pr?blems rent passes easlly through a condenller of eWn l!�at1 , The\'e are a .goo� many other POl;'1tS of .mterest \V�I�h spring-up daHy which cowmand the attentiOn or capltc1ty, it will be found qUlte natuMI that iloI1iiectltlg Wäy be observed. m connectIOn wlth such a machlllp.; engineers . only one terminal to a body of the sarne siz(\, no m.atter I Experiments witb, the telephone. a eonductor ih � In the last few numbers of the Engli�h journals, prin-h?W weil inaUlated. impairs consiLh�raöly the striking �trong fieltl or w:ith .� . p,()uden><er öral'c.!\ cemto affohl cipally in the Itl�Gtl'ician, there have been several neW dlsUtnct' of tbe are. certain prOof that sounds tal' above the usual accepted lUatters brol1!!ht up which have attmcted wore than Elpel"iII1ents with Geissler tubes are oY special ttite�-lItt1it 6f hearinl! would be perceiv�d,. A telephone will usual attentiolJ, 1'he ruldri:!ss of Profe�sor r.rtlOkeli hlM eilt. A Ti exhausted tube, devoid of electrc .ide� öf i!. nY kiri,d, elUU, notes 01 twelve to thirteen thousand vibrations l' evived the interest in his beautiful and skillfully ):ler-. will light, up at some d. istance from thecöiL . lf ä tube per second, tb�n the iI;lilbility of tl:Je eore to folJow suc� fOl'llIed experiments, the efl'ect obfJer\'ed on the Fer-fr"m a . vac�u!D pump 18 n�r the cöH . , t11e."'ho�e of the rapid alternah. ons begIns to teiL H. however, the mag rallti mains has elicited the expre8sions of opinion of pump 18 bnlJ\antly hghted. An \ncande�cent la�p ap-I1et and cor" be replaced. by a condellser and the te1' some of the leading Enghsh electricians. and Mr, Swinproachetl tö tBe eoi! Iightslip and gets perceptibly hot, minals connected to the high-Tension seconda1'Y tlf !i burne has brought out ;;ome inreresting points in con-If ä lamt) have the tet1Ii.inaJs comiected to one of the trans former, higher notes lUay still he heard. If the cuf nectlon wlth cOndensel's and dynaUlo excitation. bindillg posts of the coil and the hand is approached to rent be !'ent f!.round a fit;lely laullhated eore and a ::;mall The writer's own ex�riences have induced 'him tö I the bülb, a very curious and rather unplea�ant dis� piece .tlt thirl sh�et �ron be hel� gentl� against the core, Venture a few remarks m regard to theBe äfid otb�r charge from the glass to the hand take!! pl�e, !tnd 4-i;\'l a stlliiid may be stIli heard wlth thJrteen to fourteen QJatters hoping that they will afl'ord Ilöme useful infor-filament may become incandel!eent. THe disellarge re-thousand alternations per second. provided the current tll ation 'ur suggestion to the reader. sem blp::; to some extent. thtl st�nl issiiing from the is sufficiently strong, A small coil. however, tightly AUlong his Ulany ex})(\rhnents Professor Crookes plate-of a powerflll To\;\pler lliacbine, but is of incom-packed between the poles of a powel'ful mallnet, will shows some performed with tubes devoid of internal parably greatei' tltiaiitfty. The la�p in this c � e acts emit a sound wit� the a; bove num�er(lf alternation". and electrodes and (rom hIS remarks it must be inferred as It cotldetlser, the rarefied gas bem� one coatmg, the I arcs may be audlble wnh still a hlgher trequency. The that the �esults obtained with these tubes are rather opel'ator's hand the other. Sy talung the globe of a I limit of auclition is \'ariously estimated. In Sir William ttnusual, If this be so. tlien the writer I1IUSt re � ret thai lamp in the hand, and by bringing the metallic termi-I Tholllson 's writings it is stated somewhere that ten Professor Crookes. whose admirable work hall been the nals near to or in contact with a conductor connected thousand per ßecond, or nearly so, is the limit, Other . : . delight of every investigator, should not have availed to the coH, the carbon is brought to brtght incandes-
doi:10.1038/scientificamerican03071891-12657supp fatcat:bw3ycmi6b5fgjdpexo7zjqa5lm