Editorial: The Tesla Lecture

Saturday, September 2, 1893
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Von. XXII. No. 10. SEP11-:Mmm 2.18921 167 THE ELECTRICAL VVORLD. , _, ..A, f fa' "1“5j -..V ` T 5 = 3? if V fr - - » /lx ~ ‘ PUBLISHED EVERY SATURDAY BV THE W. J. JUHNSTUN CUMPANY, Lillllltill. 41 PARK ROW (TIMES BUILDING). NEW YORK. Established 1874. Incorporated 1889. \‘Eltlll0llB C3111 Cllllllllrll 924. Cillllll Adll.l6SiC "lI1IHJIIlD81," IW Ylllk, New England 0tIIce. |320 .\tlan\le Ave., Bosnian. Wenierll 0I\ll‘¢. 936 Jlollldllvck Block' CIIIUBED. Pllllldelplall (Milne, 927 Chestnut SIPGEI. SUBSCHIPTIDN IN ADVANCE, UNE YEAR. S3. (lncludlnz Postage ln the U. S.. Canada or Mexico.l In requesting your address changed. aiu: old ¢1.~ wella-1 new address. |§§T¢\||l4lSl'lED 19 YEAIIS AGO, THE ELECTRI- CAL \\'0l¢l¢D ll the Pioneer Electrical Journal ol’ Amarlca, and ln: well mllnulnecl Ill lend. ll IN the lu\|\GES'l' Cll\CUL<\'l`|0N nflllyeletlllcll PQl’l0dlcll Ill the world. and In the BEST ADVEIKTISING MEDIUM. In the growth of THE ELECTRICAL WORLD, ln circulation, slze md general lmnrovernent. the value ot lln column! lor relehlnz those sngnged in aleelrlcnl pur- Iulll has not failed lo be lpprecllted by adverthnerl. The following table shows the steady onward march of the paper in this department of Ins business, notwithstanding the numerous recent consolidation: umonz electrical companies: The first issue of 1l"8lcnntained as dilferent miv'|.s, , lsss confined usd use “ 45 ‘~ '~ l 1885 " 23»\ lass " ea °° ~° wsu ~~ use wal ~‘ sz " " l mm ~ :us was ~‘ wo ‘- \ new '- au; lass '~ iss " “ ` nm ~~ an ms., .. W .. .. itferenl. a\dv'mz No anrouncemeuts nl lhn Publisher are included ln this Ilst.. “ WANT " AND " Fon SALE " ADvER1'\su|EN'rs are I Epeciul fetbllre nl THE El4EC'l`l\lUAl» \V0llLD. Position Wanted small Advullhlsemeuts cnst but Sl. an lnsarnnn; Help Wanted and For Sale small advertisements cnsl. bun $1.50 an insertion. Rxemll. in advance for the number of insertions desired. THE ELECTRICAL \V0lll|l`l9§ Adverlllllli Rl!-el ure much lower than those ol Any uther similar publication. cir- culation and standing considered, and vary according Lo space, vominn and number of insertions. Quotations nromntly furnished. Address and malge drafts, orders, etc., payable xo THE ELECTRICAL VV ORLD, 41 Park Bow, New York, OR ANY OF THE BRANCH OFFICES. VOL. XXII. NEW YORK, SEPT, 2. 1893. NO. 10. Th, 13.1. Tm: lecture delivered by Mr. Tesla at I-w¢\m~ Chicago on Friday evening of last week was a disappointment to those who expected to be entertained with brilliant experiments in luminous dis- charges. transmissions without wires, and other like sub- jects with which the name of Tesla is so intimately as- sociated. In place of thege experiments, his audience soun found out, what perhaps many of them did not know, be- fore, that the subject of the lecture was mechanical and electrical oscillators, a purely technical subject, involving* but a. few experiments. and these of little interest except to technical- men ; those of his audience who were not technical men were therefore disappointed; instead of being entertained they were being instructed with some matters not easily grasped by them. The apparatus form- ing lhe subject of his lecture was a true Tesla surprise, as will be seen from our brief report of the lecture. _` Il: con- sisted of a pneumatic oscillator. the underlying principle of which is analogous to that nf the Leyden jar{ the result accomplished being that it produced short, rapid, mechani- cal o=cillations : but it cliifered in that these osclllations were of au absolutely constant frequency, as constant as that of a tuning fork, a feature which may make the ap- paratus quite a valuable one, He uses this to generate nl- lernating currents, simply by oscillating a wire to and fro in a magnetic field; that is, instead of a rotary motion in an nlternaling field, he uses an oscillating motion in a con- stant bipolarfield. While the currents thus produced at the lecture were quite small, still it is interesting tn know that alternating currents of high frequency :ind of absolutely constant frequency can thus be produced, and that. hccord- ing to Mr. Tesla, both the output per weight, and the eliiciency are very good.