Southern Argus. [volume] (Columbus, Miss.) 1834-1842, 1841-05-05

| T'r4v The discovery OF
nrocess of engraving on copper, ard obtaining
| fac sen,ileS of engraving on metals, by means
Iof electricity, is one of the most extraordinary
events of modern times. The ingenuity and
the importance of the electrotype. Is second
only to that ofthe daguer-reotype; it is great
and fertile principle both in art and science
Metal is decomposed by galvanic action
Conner is in this way reduced toa state OF en-
fire disinteo grafton or solution; 1t Is resolved
INTO separate atoms, which are invisible to th'
human eve but the metal is afterwards re
constructed IN any form we peaGe,and become
as firm and as solid as before it was submltte
to the process.
In order to obtain an exact copy of an engr;
vino. the sheet of copper, lead, or type-met
containing the orginol engraving, is nnmerse
in the palvanlc trough, and IS negatively G;
vo,,;;z,3. it's beck esaa edges are covered VIII
double coat of thick varnish. Another she
of copper, positively galvanized or piece
sulphate of copper, is then put INTO the a, az
LIQUID, and is decomposed with great rapiuH
it is completely broken up INTO ndlviduai atoi
which slowly and gradually approach tne 81
face of the plate of metal, on which Is Ine
craving; settled upon 1t, and so arrange me
selves as to cohere or unite comPact!y !"
each other. The hollows, or engraved iines'i
2. COMPLETELY filed up, and every connguratlon
the surface is exactly answered by the aolc
,or- mo surface of the deposited mass Inc ann
4 of the plate for the particles. OF .nat pow
mes whatever it be, that determines ther mo- 20,
sin towards the plate, nsures the cioSeness o. !.
-ath contact with every point oil IT. Ihey thus
peet scend in slow ard regular succession an.
INV terweave and bind themselves togelier III
rinc solid mass. The deposlte is continued
sin. the plate is formed, or cast, OF suthcient u
moh ness. On being withdrawn, the two paie'
h nv easily separated by The application OF hea.
n no the one is found to be the exact coun'erP'
the other, sharing IN all It's. Periectons a.;
m. fects. The slightest mperlecloh ~ 'o oa
the plate will be Vigorously copleu ~ - :.
by the deposite; every depression OF all .
IVA breadth in the former VIII pc ai9w.Ie'
; ' Smu corresponding elevation IN the altet.
sum- ua;,d can hardly conceive anything surpa
men this in the art of metal-foundlng.
WI. wa, Bv means of the plate, now formed in
y. rot one or more exact copies oithe original
no vino NAV be obtained. This pate mus
4, he placed in the solution as the mould
denosite will be made upon lt,whose llnes
the reverse ofrelefwin be Identical VIII
of the first original plate.
This art promises to be eminently use
)uv. multiplying copper plate engravlngsi a
MN. .b lu Process, the objection TO copPer-Pla
Robert cravings r that the plate will soon be wo
E entirely removed; for any NUMBER
no tro T duplicates of he original can \
Ak. tsken a, a very inconsiderabe, expense.
nees in time time employed in obtaining. ddPhGa'e
an original plate is about fortmsh1
al aia ~ thus obtained, though more b.
Con,mo' much much harder than ordinary copper. and
:, in the low much greater number OF impress
ing taken from it than the orlgina, pia'
, to the The value of this new principle Of ,
hers re- r,,st he obvious to every one. ltmay
Of in the cd TO variety of purposes OF great mI
and the worth ofthe principle to . seen :,
eat lion. also he very great. 1t appears from |
ngel6the mar man papers that this process has oeep
nger he l1 HerT;vOn Puttkammer,the editor o.
follow. Usr;odcal. to the making ofsterotyPe
beast Of Es eS printing. The saving Is
strech nnns;dersbIe. as the value OF the SUI
nd gored conner conner precipitate, is tring compa
and great t tpp exnepse Of casting plates in tPer
ant down rme as the copper-plate may De
md great IF the suIphate trough when very INN h,l
oe HIM :. ' made Of any desired thickness 6y
the lion Oo o I ofmelted lead on the back'-bos
But the ccntils Journal.