, 1881-06-30
EUREKA-IT'S IRIDIUM
What Electrical Light ExpcrlmcntofH
Have [sncia Looking F0r-N9 1iore
Carbon pOl,tts--Fhe Now Metal lr1.
s3fttt1l II tin 'Tllluxs

What Electric Light ExpcrlmcntcfH
Have tsnci Looking For-N3 More
Carbon pD1nts-'Fho Now Metal lri.
t3tttn IL TIN 'ThInEs
EiutinEuif Gasesis. Jutt Is.
Much has lecn snl, and written cuncernlng
that gas'osscsnfnatlnK Invcnh0n4 the electric
light a,d tho rsnstor is ono In which many met,
Of scIupcu nro Interested. Iicncu. II rotation Of
tho facts cnnccrnfns any now discovery Is
lnIlrd With interest md read With artlity. 1t
w.sa principally tho latter reason, t4lo from his
own curiosity in tho matter, thht led Guzctte
rcpnrtrr tn visit. Sir. john Hollands lcwolry
sluru, West Fourth strput, Inst night to sec tho
working IF whit Is known Us tho iridium cleo.
tric lamp Which wns ttlon bcIiu FIRST exhibited
10 tic public. hr Ut lcnst that portion which
either business or tho pInnsurcs Of m evening
promenade called 10 ltat favoscd thorough
farB+
Thp iridium lamp differs only IN olto respect
from tho Maxim lnnp now IL use III front Dr the
FlUrcntino Hotel, Int In tho eld tho difference
IL vtlst one III Tho electric ln1nsi In nsa up to
tho present time both tito positive md hcgativo
electrodes nse OF cnrbOll, which, while bt!ng n
very puor conductor vi tho electric current. ID
likewise susceptible 10 bent, burning nway very
inst under tho ntpnsc hcat induced hy tho tr8-
,nrslaoits rurrr'lt plsslng through II VII cn tho
| machine Is III operation. III tho lrfdtu tn lnn,n
tho pos!tlvD ctccsrtdc Is Of cnrbuu md tho negn
tive Of Iridium. Tho wuy In which 1t carno 10
| land WIS cngagcll FOR number OF years fl cx-
| prrln,enling III uh s0,nu ,netb0d by which ho
might he enabte to [ttso iridium. Aftern Tong
time. hu was successful In his utsosts: but 1t wus
| folnd that tho composition, us II thun
WIS, wurl, melt rcadlly, owing to tho amount
| fMsltlg PROCESS. At tbnt Juuoturu, Ptr,r. Dua-
Icy. 0f tho Ohio Medical GolIegc. took the
| he t.u!lA tut sc;Iurrtc tho phHphorus al irIt'.
nm. nn,'kIMg Il i,aaln i.on. lnsiIIe and prepared
rid were eet forth III II lecture which hn t!ellv-
cred. and which was published III tho Gazettc Ut
Wtllu tho abnyo good work was go,nE un cx-
per.nen,A with tho clcutrle light wuro bo!ng
it,ntlc iii tho OhIn, Mccn! Co!larc. whrrrIn Mi
Tho negative cArbt,t clcctrOttc, but It wns found
toe!. ton re,.tlI!y y 10 bS Of my !astng uss The
raper Il u ths Raary of WI IT, VIZ feS
number of years I'ast bud l,ecn nttractei to tho
r'; Mn w,,y W M t try iriusf J. viii ' lint end II In IL
view l,e sought lraf. Du!oy. md asketi htm for
with sinitclncnt oi wEat ho iiai found, mud Tho
aIro rlvinr H. assistance, and tho iridium Jumps
i, Conversation with rrof. Dudley he stated
TINT hey wcro oxperincnttn9 II their shcp,
~ inlpetus u 00 revolutions ror Minute:
car.'an i thcy oStas m isht 1T nj, bHt tat I'M.
medlNtuiy tho unrbun point Tavo nlacn to tho
| iridium, d light or acyeI1tl hundred cuIlde- -ppwcr
wnskulItNluri. AMI whyY As lcforu stntc4l,
rilrGnn IL II puDr conductor, and a powerful
cl,TrcHt must au lntitrcsl to hnye u1y ctrert
| ut NIL. Oh tho contrary. lrtium xlyes fro
/ 1n:Ang9 tn tho current, III that WY sAvEuE
/ it least 10 pcr cent nf electricity, and It.
| Il claimed that with tho slltIlu RIEouut Of
power seven Iridium lampH can he used,
| WhCre by tho old way tho c!1rrcnt viii feed Uniy
/ ilyG. Indeed, stut0 enthlEinhtfo Eclcurists
Gsn.t1I double tho n,ltnhcr nf Iridium ntups for
| tho snnlu power. hut l'rof. Dudley is moicAt
Mtitl says III, decided 1t seven 10 1.-Two IN fAv0r Hf
tho new light. Tho iridium point. IL fnlGstruct-
| lhic. whurpNy II Kreat expense Is Aasctl. 1snL
Tho most 'mpurtnns nolnt IL thts; Tho poi!t of
light nlwnys rulnnlns III tho sumo place. fnhktnE
whit T. known as focusing iatnI. und ct,, q,
llonnl ansl intrIetc t'nchfnery. Tint H. Ia tho
low. ns,ls t,Il, and consequently Hlnks dow,l,lt
Ii tlscti VI, hcn!tl'ylt. tho effectiveness Of tho
| retlcctar wOit11 10 eDuh lost. In tlio tu,y lAmF
tlusUyer te negative iridium polo Il stationary,
md tho positive o1u ns It burns ult flfs con.
tlill,Ally down. III Ursiur tn bhtnin ii. sMlnnnry
Ur focusing tight H. tho MID aMp Il wns nccessa-
| rs til construct cUekwnrk nlAeh1uery, which
ct,ilstAly pushes thu negative polo tU its place.
4 Tiern Ia nsu ttccIt!ad tlIItorouu1 In tho light,
tho ilnw havin, mono OF tint llcoulinr blue tngo.
| atil IL bbslutA mich Rlftur to tho Uyu, Nor
.lnns It tiiuker u,ld tlrH like tho oil light. Thu
! now lntrtiS8llptlt ls etrtninly HiEatltU strilu
| tuwur!l porfeuti0n. TlIH sntla t,HGhIno IA tnl-
| pI0ye ~ producing tho current III Wns used
| with tho old lnfnp