The Hillsborough recorder. [volume] (Hillsborough, N.C.) 1820-1879, 1858-12-08
tho service &C ths art. to make its pictures

tha service of the art. to make ito pictures
more accurate in drawing and more rapid IN
execution. M. Niepce then showed how
the sun could be made to do the work OF a
photographer. lie covers a lithographic
stone with solution Of bitunen in ether.
over this he places any photographic picture
on glass or paper, or an engraving. This IS
subjected to the action Of the light. The |
stone il then placed in bath of ether, the
portions on which the light has acted beng |
soluble and the other portions insoluble.
The stoneis removed from the bath and q
delicate picture is found sketchea on il BY
the insoluble portions of bitumsn, from which
Autographs may be directly printed.
Our columns have related, from time to
time, the various improvements OF this sun
picturing art, especially in its relation TO as
tronomy, where Improvements have been as
remarkable as in any other of its numerous
branches Our advertising columns have
shown that photography was successfully APP
| piled not only to photography, but also to
wood engraving, and that with the greatest
success. All these impressions, however,
are DC little durability and permanence, COM
pared with those on copper. From the Lon
don News we learn that Herr Pretsch has
sought to make the sun copper plate en-
grayer, and has succeeded. lie finds new
d property OF matter as strange as that possess
ed by bitumcn. He covers : glass.case with
d solution OF geiatine, mixed with solution
Of bichromate OF potash and other chemicals,
and leaves it to dry in the dark. On this
Iplate he places his glass or paper picture
which he wishes to engrave and exposes Il 70
IL r.. kn4n No fur n N
pears on the prepared gelatln0us surface.
This is dipped in water. The moisture
, raises the picture in relief. It is dried, and
found to be stroug enough and deep enough
to afford an impression BY pressure to warm
/, sheet Of gutta- percha. This gutta-p ercha
impression has but to be covered with black
lead or bronze powder. and placed in vol
taic circuit. to be covered with copper BY the
electrotype process-itself wonder Of won
ders. Tie copper-plate thus produced Is IN
relief, but, being placed in the matrix IN The
galyanic bath, il produces as many engraved
copper plates as the engrayer may require
Fox Talbot, the father of English photo
graphy, goes step beyond this. He place
! Herr Pretsch's solution Of gelatine AM
: tbichromate Of potash directly on plate Q
!. polished steel. The picture is impressed Of
6 this film as before. He discovers that Their
i no necessity TO peril its faintest lines b
\ immersion in the waterbath. Over the fain
!. photograph on the gelatinous film he Sits
z thin layer Of powdered gum copal, or eve
: rosin. The plate is then heated over sPirl
2 lamp to melt the gum, as in the common etcf
I ing process. solution Of the peroxide {
Y iron in muriatic acid is poured over the platt
: which etches out it, surface wherever th
light has acted on the gelatlne. And thu
y light leaves lis delicate footprints on IN
e perishable steel.
re The engraYer Of the highest order. who
an artist as well as . manipulation, may ST
er produce the best efforts Of his art, but lnstea
e ot having for his audience only the favore
n few, he nav be admired BY the million
e we'll. The cartoons Of the great master
y which fill choice inches in the royal galieri'
&c and grand eathedrals, tie statuary which 4
pilgrims Of the world 90 % far 70 see, y
he masterpieces ia plastic and pictorial ar
y. with ali the wonders Of nature and scien'
81 visible 10 The microscopic or the astronome
= nav thus at no distant day come to adoI
ne tie cottages Of the poor.