Pittsburg dispatch. [volume] (Pittsburg [Pa.]) 1880-1923, 1892-02-14

finest iSinglass. and so promising was the
plate that he felt sure he wa, on the
lJ track. He was using iodide of silver,
as he had been accustomed to combine
collodion. Despite the most careful
ering, the isinglass failed to yield a
Eciently even surface. Then the happy
uChT struck him: Why not try gelstine?
--unately q packet of it happened TO be
the house, and by dissolving it he Sc
ed = much better surface than he had
q the isinglass Just then he had been
7;ographing some laurels, making a
ler poor picture What could improve
g imperfect plate? He remembered hav-
beard that for foliage the bromides
-e better suited than the iodides. To
hromides, then, increasing the quantity
Iessening that of the iodides he turned
90 marked, at that point, was the success,
u ne settled on the use of bromide alone
en the first effective dry plate saw the
at Of day Dr.. Maddox at once pub
I5d his experiments. To some of the
rst ingenious minds in the ranks of pho
reanhv, professional and amateur, their
mise was as certain as dawn. Very soon
Ealstino-bromide plate, as we now know
WIS brought 10 perfection.
Raising Subscription for Him.
In the final Improvements Dr. Maddox
x 10 part, as his health had broken
wn and be was forbidden to work. In
= . subscription, toward which American
0t0graphers are making handsome contri-
lions. is being raised for him because he
iairm and poor. Apart from the SUBJ
option, the man whose skill, fertility of
source, and perseverance led the way to so
any Jriumphs Of science and art has been
-s-iy without reward.
Because pictures obtained with collodion
8,ss are the most delicate and beautiful
camera can give, repeated attempts have
aG made to increase their sensitiyeness,
-- SO FAR without practical success The
..-a We owe TO DR.. Maddox continues to
- lis place IS incomparably the most
and convenient the photographer can
-.1T.
Let Us glance for moment at some of
revelations won through its exquisite
L.Teuess. In the hands of Muybridre,
Philadelphia, with exposures in extreme
7Es estimated at only one five-thousandth
q second, horses have been photographed
King and galloping, athletes running and
inning. That and similar work has had
seiaet effect on pictorial art. Meissonier
d other artists OF eminence have given us
presentations Of animal motion revised in
Ie light OF the cameras disclosures In
itching the swiftest motion in an instan-
Aeons phase the dry plate far excels the
.p2bility OF the quickest eve.
seeing Photographs in Motion.
That, however, is only one of the many
sys IN which visual capacity falls below
lst OF the dry plate. But if the eye, mo-
ent by moment, cannot separate the |
bases of motion, 1t can nevertheless follow
at motion in its continuity. Can nbo-
igraphy reproduce such an impression9 TT |
can, then it NAV boast not onlv rnucb |
over that the eve has not, but also everv |
over that it has In its first attennt ~ |
mex this last outlying province to its
upire the camera allied itself with a de-
ice regarded, when first invented as littIe
ore than a toy. In its familiar form the
.etrope, or wheel of life. consist, of q
r indsr, eight TO ten inches in width II
open at the top, and around the lower
[ of its interior is placed a series of nict-
-s showing, let us say, horse in the spc-
.asive motions Of a leap over a hurdle
1eee pictures are looked at through narrow
,-tic2l Sits il the cylinder the apparatus
lng meantime revolved rapidly. Befor.
e image Of the horse in its first attitude
IS had time TO fade from the retina. a SEQ
ID image showing the next phase of tn.
..D is ltfelNGll. anu 81 Oh throughout The |
ries Through this effect of the persist
oe Of vision, ss it is termed, the impress
ras blend into continuity, so that one
ms to be looking at a horse in quick mo-
1n through the air.
Edison's Contribution to the Idea,
N the early DAYS of the zoetrope its
cures were roughly executed wood cuts,
hen these were replaced by succession
lrstantaneous photographs, much better
r-is were produced, Something, how
r. was wanting. The photographs were
sen At too wide an interval of time for
cir outlines to fuse with precision. That
IS the condition of affairs when Mr. Edison
gen work on the kinetograph. For the
yparation of its pictures he has invented
which takes photographs on a
rrow continuous strip, at intervals of only
e-torty-sixth of a second, the exposure
ting one-sixtieth of a second. The images
developed by CAREFUL v timed machinery.
When the strip is moved swiftly under an