File:The American annual of photography (1914) (14800062343).jpg

Identifier: americanannualof28newy (find matches)
Title: The American annual of photography
Year: 1914 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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t is not satisfactory, it can beused as the basis of an interesting experiment. Clean the oldemulsion carefully from the screen, being careful not to scratchit in so doing, dry it and put to one side. Some fine day takethis screen and a panchromatic plate of the same size. Putthe panchromat in the holder, and put the screen in on topwith the screen next to the film of the plate. Reverse theground glass of your camera, put on a Dufay filter in front ofyour lens and give about the same exposure as an ordinaryDufay plate. Develop the panchromat plate, cutting down thetank time a little or using a smaller development factor, fix,wash and dry your plate. Now make a lantern slide fromthis, making a rather soft slide—not the ordinary snappy sootand whitewash slide. When it is dry, sit down in a comfort-able chair, and placing the screen used for taking over thepositive, register the colors. The first thing to do is to get theplate free from the appearance of color. By rotating the plate 46
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OER THE WESTERN SEA. JAMES N. DOOLITTLE. very slightly, this is easily secured. Then begin by movingthe plate very slightly in one direction and then another untilan appearance of color of one sort or another appears in theplate. Generally when this result is secured a slight pinchingof the two glasses will cause sufficient slip to cause the colorst6 appear. This sounds a great deal more difficult than itreally is, and I can assure anyone who tries it that they willfind little difficulty in producing an excellent color plate inthis way. I do not believe there is any infringement of theDufay patent in using a waste screen in this way, as the plateswere at first made to be used with a separate plate. Person-ally, I have secured better results on the Dufay than on anyof the other color plates, both in transparency, and in the factof their standing the heat of a projection lantern better thanthe others. The colors I believe to be as true as those in the other plates,and they are simplicit

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