Lancaster daily intelligencer. [volume] (Lancaster, Pa.) 1864-1928, 1889-07-20
AN ARTISTIC EVOLUTION.
THE SUNBEAM tiAnNEssEo TO THE
PRINTING PRESS.

wascd Paper Negatives-Ths Father Of
Modern Practical Photography - vet
eran" Roche. Typical 1nventor-Photo-
Mechanical Printing.
Especial Correspondence
NEW YORK, July is.--The great defect
Of NJ. Dagucrre's invention was that the
images produced by it could not be multi
piled except by repetition, as many times
as copies were desired, Of the costly and
tedious original process The fact was
clearly apprehended by scientific and
practical men that he had but opened the
way TO field Of infinite possibilities. II
was not yet enough that the sunbeam
should be imprisoned in the camera; IL
must be harnessed to the printing press.
| A crcditable attempt in tina. direction
| was made by Sir w. X. Grove. who not
long after the invention OF the daguer-
reotypc. discovered u1eana OF etching
| Il In the plate, with acid. TO n sufficient
depth to enable--with very delicate ma
Eipulation--piinting from IL, but his
process was merely an ingenious and ex-
| pensive curiosity, failure for all prac-
tical purposes. The steps were slow by
which the present perfection Of the art
was reached.
Mungo Patton, in 1880. discovered the
sensitiveness of bi-chromate Of potash to
| light. In lSiI, Fox-Talbot. OF England,
did the first real photography by what
he denominated the "calotype" process.
but In what would now seem very
crude way. He made his negatives upon
| paper, which was subsequently waxcd
and rubbed with hot iron to render 1t
semi-transparent. Then he made his
positives upon paper over which bad
been floated albumen charged with
iodide of silver That process, OF very
close approximation to it. by the way, is
still In use in Paris for the making Of
magic lantern "slides." an art in which
we now excel.
Louis Alphonse Pointevin In 1865
made the great improvement of employ
! ing for negatives plates of glass coated
with ''gclatine or other organic matter
| in combination with the bi-chromate of
! potash or of ammonia" From this point
really have sprung all the many ingcn.
ious, and for their respective uses
enormously valuable, processes Of pro-
ducing photo-relief, photo-litbograph
n,i,,;ny Volumes wonIJ ho ron,,irod
| to ra,an;,ul,ta tho ;,nro,o,,o,ts ,,d
variations ,Lot h,ra hoo, n,,Jo s;,ca
pnin,ovin,, ,;no---i, ,,, ciy;J;yod com.
| t,;os INIT nr;,ci,,,lv i, Tho IJnit.d s,,,oo
but all rest directly upon his invention
as base, and Pointevin as tho father of
worthy of honor in ro,norbr,nco ,h,n
Docrnrro I, 4, ,r,,. ,ha, T., tsi, NJ
do (, Victor usoJ ;odiyoJ oIh,,,,, a,
,,,ss oon.i,;,aJ ,,.;,,, ,itr,,a az Ii.
With fairly GOOD resuIts. also that soft.
Archer 81 Enolopd in is5I brongh, col.
iod;on-.ybicl, bnd tlon roconiIn hoon
;nyen,cd Cor ,,rgic,, ,,,o, lao Ia Grn,,-
intouso but no;tbo, ,f ,bo,, ro,ohoI, ,ho
no;nt os nr,ct;c.,Iity attained Ly p,;n,o-
vim with re,a,inn NJ p;orre J,raco
Aloxia G,,d;, 4, ,s,o in,.oa,,ool . a,,,
Iodior, emulsion H., ,oru,Io ~ ,rh;oh
d;a not ,,a, into ,,ensr,I ,,so hut sor,.o1
os tho S,si, Tor n n,mher 20 ir,nrcro
nen,s !, Ii,,lo l,tor ,,l ,,oo o,,,I>o,
,nr so,or,I yo,rs ,I,ara,r,or T., ,sc; ~
made n cnj,t;no emulsion and called -
"nho,o,ene
Not Iong ,s,sr po;,,o,;n,s d;,oo,u,,
paul prc,sch ~ y;orn, fnn,d ,ha, /,
be co,,ed n nI,ts ~ ,,lnss ,,;tL h;chro.
mo,ized yola,i,a ,o n tbick,ess ,broo .,
four times os Great as that cmn,oyed bv
poipteyin. and when II was drv exnoaeI
il in contact with n nbotogrnnbic live
negative. the celatine where the LIGHT
acted upop IL wos rendered ipsoIubIa and
hard. whilo from tho other ports where
the light had not acted. the bi-chromote
could readily b. washed out and the
poIatino there would absorb water md
swell nm inst i'm pronortion as il had boon
protected from the H.bt. piving n NOR.
feet matrix from which pl,stcr casts or
,lectro,ypes could IA, maio So doi;c,,,
but sure was the action of tbc Iight that
half tones were pres,rv,d and the ,onro.
duction of accurate n,intaL comics of ,bo
original seemed to no ,hoorntic,IIv n,
Ieost merelv , matter of color and In,
prcssion. In practice however II wos
founl that ,bpro was =, c,ro,t de,I ~ a.,
movement still necessary before tho nro.
cess coulI mo mazda comm,rci,lly ,aI,,
BILE. One of the moderately successr,,
methods tried WAS that of coating metal
.lates with aspbaltum. which hardened
under the light and could bo removes
readily by solvents from the unexrosoi
parts. thus nresep,ing n surface for o,ch
inc. Lined and s,ippIed work could IA,
wen reproJuced in that ,vov h,t ,h,
usefulness of the proccss was limited
pnirto,;, nr,i,,ool 80 ,,,,,, =,
by coating his glass plotes thipIv viii
celatine and nrintipg from Them os from
i;tbogronbir stones Tho ,o.ts oynns,J :,
I;.bt ,,tinc ink Will ,in., ,ot a,,,,,,s,,l