Camera Work: A Photographic Quarterly (1904 (Heft 7))

while with ordinary plates the rendering is improved by the esculin and
injured by the chrysoidine or uranine.
To demonstrate the qualitative difference between a " white" ray-filter
of esculin and a moderately deep orange-yellow color-screen of uranine, I
made a photograph of a portion of New York from across the Hudson, on
an ordinary plate, part of which was covered by an esculin screen and part
by a uranine screen. The foreground came alike in both sections, but the
distance was rendered considerably brighter and clearer under the esculin
screen than under the uranine, thus proving the superiority of the blue over
the ultra-violet rays for definition of distant objects in a landscape, and also
that the efficiency of a color-screen may not be judged by visual examination
alone.
Even the yellow dyes most approved for color-screen making, the
brilliant yellow first used and recommended by me, and tartrazine, recom-
mended by Dr. Miethe for light color-screens, show absorption in the blue
of the spectrum, which is disproportionate to that in the ultra-violet, and
may therefore be advantageously supplemented with something like my dry
esculin screen.
It should be said, in conclusion, that it is possible to get so much
esculin into a thick film of gelatine that it becomes a color-screen, although
an extremely pale one, only the spectrum violet rays between G and H
being perceptibly absorbed. Such a screen is not only “quicker,” but more
efficient in landscape-photography than ordinary yellow screens two or three
shades darker.
Frederic E. Ives.

THINGS WORTH LOOKING INTO.

THE FINDER of your hand-camera in the St. Louis
Exhibition grounds where the Eastman Kodak
Company succeeded in obtaining free admission for
all hand-cameras up to and including 4x5.
The enlarged home of the Graflex and Graphic.
There is no admission-fee, and visitors are always
welcome.
The pen-pictures by Joseph T. Keiley, appearing
in Photography (published in London, 3 St. Bride
Street), of some of the best-known American pictorial photographers.
These articles are upon novel lines, and are illustrated with characteristic
examples of the work of those photographers of whom they treat.
Mr. R. Child Bayley, Editor of Photography, has spared no effort to
lay before his readers an adequate conception of the personality and
achievements of these American workers.


St. Louis and the
Kodak.

The home of the
Graphic

Pen-pictures by
Joseph T. Keiley

The two splendid numbers of the Photo-Miniature, the one devoted to
the Hurter & Driffield system of exposure and development, and the

Newer numbers of
the Photo-Minia-
ture

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