New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1869-08-25
THE SCIENCE ASSOCIATION.

SALEM Mass Aug 29.-Thc ASsori'u"" NJ /
as usual general session at 10 a 10 A'o ,
Committed prosecuted the Dames OF ~ I''W -,
were elected wiihout opposition Iho 'fo''N.r' -
nj ~ ,,pd m i,snossible for them 20 visit the pnoo
tus,,B;ious az Boston in body, owing 70 Ae plcS,
business ard the very courteous invitation % "o -,
apdS1ty Government OF Boston must 'hcfeioro -
oltued several other INVITATIONS were '~i'l'O"H -,
the reueral meeting adjourned, and VS A'So0'"
al sections as usual LOTION
r, section having On hand toe vast subject u .n'
-, met Cor the day IN the Tabernacle Ch"'ch' IIoi'
p.rca octlrg as chairman for the day iho WHO N'
r,,od in tr,e discussion OF that rare PhenOmehoh'
a., o,,,,,, in the presentation OF reports nom zoo
to,,ers and the afternoon in informal yak az
astronomers told about h tie corona and protubcr
nees sSarue vsbJe, how the stass were Sc ,on
Wete inc emotrons Of people auleoned ~ 3stro1Gny
The following arc the utles OF papers reau 0" 'e 9
On Total Eehpse Of Aug ~ PCT g. '" hSngS o. \, M
sr :, TSf B ss E Eis' ' mS55rta @
Iss'Ron .. srs NJ = On Sev Mhod Of observing Con
facts Solar Ecipse BY he SPScroGope b o" 81 ,he
sS5 PTom5sss aud Coror obesd " Bgrnges Iowa iowa
10 s Coma Spectrum and the Spectrum Of tue AaLa
orss. By Pol .. 1"ps & De-. Mo1 By pof r
Ottawa H. III Total Eclipse Of Aug b. Prof Bg fS .go
70 'r. eSa,' By Pa EDWARD Pies,dug Boston.
Prof Youngs method Of observing contacts was heard
With attention. He said that the specroscGps iHFsnG9
Tie means Of q very accurate observation OF tne instant
tAC following Let an image ol
two inches IN diameter DC thrown udm 70
Bring to the center ~ the slit ana perlendcuaI 20 ~
inc point the Hb where the contact is to take PHSc
M, spectrum will then be half bright and half dusky
divided by longitudinal line OF denarkaJohi !usC %
the dark lines will extend clear across DGth portions VI
Che spectrum alike but the spectrum OF the crOoSpheo
will ie seen IN the Eue as needle OF Scffct tght e&
tending little INTO the dUsky spectrum from 'e 80
ireIuity of the dark line an the brilliant pOfon,
moon approaches, this red needle VIII ne gtaudig ,t
eucd aHd will finally disappear the instant OF contact
tue & line then becoming exactly IKE lts helsloo4s ~
tins manner was about I'VE seconds earlier THAN that OF
any Of the other obseryat cns b9t agtee ~
of second with that obtained from measurements VI
Prof PEREZ spoke very highly of photographic ooegva
tous as the only of any high value ana ue nsV
step toward the computation OF the distance oil inc sun
viz one 10 ska not yet heard from. anc others 10 Des
Moiucs, Springfield, H. Prescott near the pouu' 81 VI
Virginia, and Tennessee and Shelbyvie, KY had Deen
charged make IL their speciality 70 4scei dln tnc s
with precision whatever else they hs1 ascrI3nSr VI
casually noticed merely incidental, Sut OF he prN
ince the Coast Survey, and was AT tue ~ to
PHYSICISTS TO MAKE sucn use t tberc were real auctua
fous i'm the suns diameter which made Impossible oas
certain the magnitude OF that important element with cor
solar pronbeances observed much carrier 9an hau
Zoe The corona might be merely an auroral phe
nonenon, might consist OF meteors shot ont IIo te
might he cuused by the suns atInosphere ALE
the intensely hot liquid masses below IL II was vet!
Gheq s% mgece theory but what ko bad heard had
rather shaken his confidence IN 10 ana ne was now in
plined 10 think the aurOral was the simplest ekpa
nation. The nebuar hypothesis was in his OPINION hoV
well founded. 80, ,.,,., -, ,....r,o
tion OF the papers Of considerable interest Pros
Hough. Could Rogers, Twlnlng, Henry, ohyers ana
having seen meteOrs passing over the black surface u
tic moon between the cusps OF the sun As tins phe.
individuals other explanation than the above seems
10 be admissible though the first gentleman who men
toned the matter believed it to have been caused by
''midges" No planet had been discovered between
Mercury and the sun. Some eountenanee was gwen 70
the theory that what appear as spots on the sun are seen
on us outline during an tbSse Observation-Disclosures
to such "A ~
surface, IN cases to i've semidsmeters might he
might be thrown 70 such distance as to float on into
The following paper was read Friday: ION self
recording Psyehroner," by Prof s. D. Tilman Of New
vice for registering the quantity Of in the air The
instrument is constructed On the pTnpe 81 the wei ana
men similar plan that shown at tho PARIS Exposi.
tou Of 1867 by Father Seoeh Of Rome In this record
Is made OF series OF points 6y means OF which curve Il
the air different temperatures This is done by con.
consist Of Of brass straps, each two being slightly
and fastened at their ends on either side OF steel
connected together az the middle, so that
aSt boT and from thence to lever The thernomeers
placed that one will be directly over the other
OF wood and IS covered with cotton wick kept wet by
Of small cup Of water, INTO which the end of the
both thermometers When both are dry the lever will be
motoness the rate Of expansion in each system
same but when the upper thermometer vet IL becomes
cooler by evaporation and the difference expansion is
shown by movement Of the lever pencil at the end
of this lever moves over paper ineloSing cylinder
which revOves by means OF eoekwork once 10 "a hours
% obtain s bT the CURVE nSf ON te s e
multiplied by the factor gwen by Gaisher for each de
gree Of heat. the desired result may be obtained
directly the machine by connecting the with
irregular cam, the curve OF which is determined by
the factors alluded TO- The representing the dur
nal changes may be made on Photographic paper by
means OF mirror attached TO the end Of the lever,
which the thermometers are entirely disconnected
from the paper or the instrument may be connected
with an electric sefTecOIdDg apparatus, similar TO that
ted ny Prof fO al
Prof Tllman also gave a brief summary Of his paper
years ago Newton delivered his first Of lectures
ON optics the University of Cambridge, England In
light bu not long after he advanced the cOrpucuar hy
pOthess In 1890, Huyghens published his "Trate de la
Iumiere" In which he supposed light 10 be pTOpagated
by undulatons Of an alpervading ethereal medium.
The corpuscuar theory was. for more than hundred
years. generally accepted and II not until after
the most seTions obieetops 10 the uuatory tbeov T
the Continent, advocated 70 the last the doc
trine Of emanatiOns which was finally over.
thrown by the experiments of Foucauit who
proved that the velocity Of light less IN
water than in air We compelled to accept the
hypothesis which the Of an extremely
atenuated, subtle. and ubiquitous fuid filing both the
elastic aud OF variable density shown by the phenom.
Of double refracuOD. That undulao1s prOpa-
gate three distinct forceb-igh heat, and actnism-is
proved by experiments on the solar spectrum Further
more it is evident that ms medium may undergo other
changes, by when entirely Inherent manifestations
would be shown How such changes be connected
with the phehoiinena ~ Slecotsy anu magnetism mas
not yet been determined troll lllhau proceeded 10
show that approximate estimate OF the density OF the
ethereal medium Immediately envelOping the earth
might be made 10y assuming mat any impulse is
gated through an elastic hud by the law which
governs the velocity OF sound He then alluded TO the
Importance OF adopting holneheIa.ue when would
clearly define the characteristics OF this vastly
Tarfed fluid IL is generally called eLer bnt this name
has been 50 long used 70 designate class OF chemical
bodies great confusion will result from applying mean
ings 30 different 10 the same word: The term lumi-
niieOus ether is also Objectionable because of the
manifestations through this medium have no reference