Daily Los Angeles herald., 1879-08-07
q Great Discovery ry-ProtoGrap phing
in Colors.
). +. Bulletin. |

Since Daguerre made his great
discovery by which he could take
accurate impressions on plates by
the aid of solar light, a large num-
ber of scientific men in all coun-
tries have been engaged in perfect
ing this discovery. The ambrotype
was al. n.improvement on the dag
uerreotype; then came the photo
graph, crude at first, but now so
perfected that it gives accurately
the outlines and details of every
ohj-ct with mechanical accuracy.
Then, the process was so far inn
proved that Impressions could be
taken instantaneously. Thus, the
race horse, flying over the track,
was photographed in every phase
of his gait. Tie swift railway
train and the swift steamship
could be taken at the top of
their speed. But the experiments
to find process of taking Impress
ions in colors had been going on
for nearly forty years, with only
moderate advances towards the de-
sired end. Now and then we have
heard of important discoveries
which promised a solution of the
whole question. Men have devoted
their lives to this one discovery,
and have died without obtaining
the secret. 1t has never been
doubted by scientific men that the
secret would yet be given up. 1t
would be possible to photograph
from nature so that an exact tran
script coula be made as perfect in
color as it has been done for years
in mechanical outline and detail.
1t was reserved for German
scientist and inventor, Joseph AL.
bert of Munich, to discover pro-
cess of producing photographs in
colors. We have before US two ex.
amples of this process sent by the
inventor to Toby Rnsenthal, the
weil-known artist now temporarily
residing in this city. They are
probably the only specimens of the
kind ever seen on this side OF the
country. They resemble water
ooIors, and would readily be taken
as very good examples of that kind
of work. Mr.. Rosenthal thinks
that this discovery will, In time,
rev0lutioniZe most of the methods
employed in the pictorial arts. The
process has now been 10 far ad.
vanced that all the primary colors
are taken with great facility. Most
Of the experiments heretofore made
have been prosecuted on the theory
that the photograph Of colors must
be taken by one process or impress
sion as the coloIIess photograph
is now taken. The experiments
were all failures.
Albert discarded this method
which bad been so fruitless. and
turned his attention to q careful
alaysis of the three primary colors
in nature, viz: red, yellow and blue.
Afterwards he was enabled to trans
fer colors one at q time In
their respective proportions or
values to paper. He first took a
negative of all the red qualities
contained in the object to be repro
duced. Then he took O negative OF
all the yellow colors, aud next, all
of the blue. The camera Ia adj
justed land that process Is probably
a secreU so that the exact percent.
age is taken of all the colors men,
toned. The next process Is also an
important discovery by the samt
inventor, viz: the Photographic
press. The plates having beef
: etched by some process known tt
the Inventor, the sheet Of papel
, which Is to receive the impression
| Is passed three times through tht
press, each time receiving an i'm