, 1875-04-22

T)UtflI;NEI) GLASS.
a unsGIr EiscNvrry by II. Etc IL R:ts-
tifs II fr"uch Enrinecr-snnic Are
ts8ie's rr"stucrd b1' ELS PROCESS
L","'on THURS.
Although ttn manufacture Of rlaes Inns been
carried OIL for about 9Ot1 Year, II does not a1-
pear TINT any attem7.s to orarcomc its Inherent
hrittleneeB nntt liability 10 fracture, nnl at tho
sumo timo 10 preserve Tia transparency. l.a,n
proved nucccasfui-if, iulcc1, tcy lave cyor
been made. which In t1u,,ttili, 1t IL i,nc that
TIM French philosopher 1trau1nIr, 1l,nnv vcars
hncc. Ia.denctl glaas somewhat by cxpuetn. it to
higltctnpcr,turs for considerable time, b..
ta process. which In sechl,icaly termed cvitr:-
tseation. wht1o It flasdctss, at tho !arne timo
ctfa.a.lizot tho Hlaes Ei.l renders it
OPAQUE. tue product being knoun NJ
1soaunsur's porcefai.. SoTon yeats Fincc.
however, II. Francois de il I,4atc,
french engineer. after lpg and patient investigation
into the sject, discovered simple Of RENDER
Ing Ea.s irac!csv unb.ittlc, aud ut the t,,nr sinc
delicate cunL!tloh7 involved III the prncess by wl,ic
he nhtaned thiA t*ult, is sttrccsl l,cinr achieved
,ic IN tho TA,na way VIA Failis.yf, but Ct.
ktpnally. For iwo year, A. d. IN N4stie, wlln
lhsc',e' ample means. trs" without uvajl lo rcljs
c,vrr tr rrvret nf hi psrctsa. ii tustt however,
he Rnrrestct In an dGnE. aud las +lnca ern Engaged
tn erfc.'lng hs Invention ah In de.cioping ator4-
tary csIeFine,t into l1raeticnl w"rktng. Thoproccaa
Of conversion III tlc ina! Fa very R bnr, sntrf.
that II 'ttA singular Il was never thought Ut lefcrr.
EEoad1y STATED, 4 contlr" tn lIeasin N" stass ut
hath coutistiug of hratcti te,ginou. cr,nrnr,,d.
There nrc, however 'nanS conditions IN cnn,rc,en
tnrY result depends, anil .a neglect ii any even In
si.gA degree, constitutes the p.irraco betwfe,
erH ~, fl fne " Th, 's q ss '4ay L.
1t may c orErir1tci and II will then lr. its rl,apc or
aga may be rrhtiy iletsetl aud Sc. l .lo u tho
orarinus constituents nr tue BATH and tleIr TEMPER
ntuts have MI important bearing upnn thu ultimate
'hava all bceli satisfactorily se.tled by II. dc il
Basste. WHO has designed furnaces aud batAs by
means Of WHICH his toneeninE PROCESS can hc car-
r1e1 out practically without tear o ultsc1anec The
merely nominal, for l.r.cs,y tic article. ARE brought
hath and instantly Withdrawn. Thu coat of temper
ing. tho. II stated to 1s' very snaa1. -
long course of experimental rc.earch 'Aiore lo It.
ta.ne! xurrcsa. lis nrst worked, N n,. cnencrr
naturally xo,l'. upon mechanical ricipiea Kunw-
ing That tue fruglity Vt RlaRa results fr tho wca
Hsa of the co4ion Of Its molecules, hi not unreasoa
ably ssrr+l that. ty forcing tl.csa uolee,,rp 1aorn
co.nIHs. the e,rensth aud re'iiisy e tbs ma'crta
w,nIa u insre2s'l..,, Bnt sMs duc,r'ne,
se H. ep aos ws,1ort f! Yin h,. ,F', ,..x nd ts r
70 'a.ahes i, evsa Il arpii"i 'oi1 wca ia t!a! =:
only force III another 1"r iht lee!.e cn! IL n:aincd.
ana ;Ae l.rca rroier,!eH ot the lnatcrla ecn'c a.
fct Ne testify frus tho rlcc,ou ni ,l,lnLer It
toushrn"3 glase articles D: the ocs+ Of Afpfssa Aq
81 10 IA lstsir in Lnganh. III t,e*r articles, whcl.
glass. 10th coiorei atd lhalu. neither tra.slnretey
nor enlor sB a,r'cl at Ill., And tie lin: ur aeu'.l
Ony slightly. Thc4+ astcfe- If them lrll.g G.-
ree'liurls tht:t-wert thrown unfortunately arrsl1
| floor. Water WIS bhtlet lit ire atnl
! the saucer win quickly rrnov''t IN cuu1lr,-
glars held by I'll" hand iu gaa l!.nr ua.l slr
CORNER ht.sarae exceedingly hot, lii I'll" r,s Wa n't
neither It cracked from Unequal cspa:,,ivii
comparative experiment waA then intde with ,irc.
rncd elaw. III or,r To show itt's rtEsetyr !nwr,s
uf resistance 70 frnctu, from ts fortc Of '1si7t Il
fsli,Ds Msis" n cae:, siv a. ssc x!sss WI 'm !
Icing lr"plel upon III eeutr". Will the triar'
gsts. .annrn 1'rsa weight faing o' i from lIee'ts
of !. and ~ inches sealsettssy did .no slara:e,
hut Mt II Inches she Gass Wis broken into several
fragments. With tlu,.ucI piece of ouElturl glas
no arsetsslon ~as lua'le s t!e sa'..o weight. Telling
simply rr'ouun9 from u! The sta1+. tn auEnec iroi,
Wight triad at :ana feet respectively rare sia..r
ts g. ss M css IT,
rcsuls proaucr: inrtfaI Of treakIug .no nLuut
a.1.ax..rd to aion. The 1arp.t fragments Eeak,,re
ah1sst hRlf-au-nth lit length anst BREADTH anil file"
were easily stSlteeli ~ sc ecFs " hto7a Varying III
e:Eo fron tlat Of rl1 poit. sp thu u large pms
htad. The lines If ftue:n:es III tic fragments rrc-
6rntrt to The ~" he alHarl1ce Of irregular lsco wur.,
aud t'.e lines wtrr moreover. rr1lat"ht to tEc Huch
but more palpatlr ono sldE nf lilo EahH tliun tbs
other. whic II sAr Two sides tic our i'm. r..
ceiyed TIM trtt IMPACT III thr .rw not ao l.,
dceTulne Another pechliasy ia Mat lho edges of
tho fracture arc by MT Ntsns ~ fharr 1!li there
furs Cup3Lle uf causing inrI>sl wo:ine, ttusa
OF Ordinary gass Il wuult seetn that tho toR.,cnr
gsasx posytrsrs r.tottnra tl,sss" prwrr, hut flat II
the equilibrium IT thu 1ufs !s disturbed ut any uuc
r.ht fI,@9Jtn ITit
tens throughout te whclr n!cc tho atoms ITO longer
| russaAAAg the Power rf tnlic4inu,
or the practical nature 1t It. tic Il Hastcs unluuG
diHaaver;; taerr eN IL q11etlnn whae9cr,
t!,rre tu any oli4 Ut a yac in the arts. 8ulencc
1 aiI manufactures. Tho rPr'rat nnH which su3ket
themselves !unnEarrahr, ahd aaovH and teynnl
tie usencrs Of fte lrFrs TitlI regard to articles Of
dnrlr*tr HInrA!it considerations affecting
tin applied ncicnte@. especially tn connection with
| chemical manufactures It'd Hl,n!lar isdusstr,
wiero a material, alike nnI1nelccl by thu nctitnl
OF huat "y atid.. la1 bsca 80 lnng and 70
yanly toi1slt fuz-rtat'y IN cnnnrct!on with yttriol
cla,hrr, III tina n.n"fatltre or su!!hutio acid, anl
fnr Erlug in chemical wnrks. For tho present tlcra
rcnaE rnr1.ne to wtch aonghcMc!i Glass eannnt
bo ~ rasy a1I!rl auL Tint IL to wis,nW Esziug ii,
or other ordinary Our akrrA will thrrcforu
| have rrfr::e. tu canuot give them mich pro
tat It wi!! nose I1nE our, aS esiHrluCna u cnnai
crahls lr"lasr are bcsns conducted with tho View "f
10 tLs lru1r ~!tes lcfuro tougbtning il desirable.
Tho girs, however, is readily engraved e't!rr by
nuurls mid ~ Tim us''al WY, or by Mr. Tgl.,aan'a
sn1 il ra, al* r r,is by tho wkse al Tor ,ro work
and the Ike, II only rtAine tn ro1ratulas III. ln Il
Bas,Ir lilo uHt:nl An valuable discovery I'm l7x
rafe, 10 add tl!4t lio II iinw erecting warl;a In
France 10 carry out Ill prctics Ills ingenious process
lIl1'pOPHAGY.