File:The American annual of photography (1911) (14781130544).jpg

Identifier: americanannualof1911newy (find matches)
Title: The American annual of photography
Year: 1911 (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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exposures. Enclosed arc lamps on stand; Tungsten incandescent lamps;Cooper Hewitt mercury lamps and other kinds work well.It has been found by some operators that owing to- low actinic^alue in light produced, exposures made with Tungsten lampsrequire much longer (several times) time than the volume oflight would indicate. Arc light stands should be adjustable. The Tungsten light shown in the illustration is a 250 wattand is in a special hanging Frink hood-reflector concentratingthe light on the object. (Fig. 3.) The large hood on four legs shown in group is made ofpress-board lined on the inside with white cardboard. (Fig. 3-) Mirrors are sometimes necessary to catch direct sunlight rays and throw them on the object for enlargement. A beam divider for ground glass measuring; accurate rule (steel preferred) for enlarging to scale; a strong focusing glass (eight to twelve diameters) ; and accurate paper scale graduated to sixty-fourths of an inch and two inches long 296 Rudolf Duhrkoop.
Text Appearing After Image:
CHILD PORTRAIT. J. EDWARD B. GREENE.

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