File:A study of selections for the variation and inheritance of the size, shape and color of hens' eggs (1920) (14763114621).jpg

Identifier: studyofselection00benj (find matches)
Title: A study of selections for the variation and inheritance of the size, shape and color of hens' eggs ..
Year: 1920 (1920s)
Authors: Benjamin, Earl Whitney, 1889- (from old catalog)
Subjects: Poultry
Publisher: (Ithaca)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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the pulletsproduced during the following year.Photography was the first method ofrepresentation considered. Since thiswas very expensive, however, thepractice of allowing the shadows ofthe eggs to fall directly on sensitizedphotographic paper was adopted.6A sheet of sensitized paper, 9 by 11inches in size, is slipped into theback of a specially constructed frame,where it is held securely by a woodensupport. The sensitized paper isslipped in back of a sheet of stockfilm glued in the frame; this film, ifkept clean, does not hinder the re-production, reflects much of the dif-fused light, and thus prevents theblurring of the shadow.7 The eggs are placed on the film asshown in figure 9, and are held in 6 It was necessary to use high-contrast paper for thiswork, in order to obtain distinct black and white tones. 7 This stock film is the base used for photographicfilms before the gelatinous coating is applied. It istransparent. Study of Selections for Size, Shape, and Color of Hens Eggs 203
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FlG. 10. PHOTOGRAPHIC STUDY OF SIZE AND SHAPE CHARACTERS This shows the appearance of the sensitized paper after exposure under the eggs and subsequentdevelopment. A record is made at the time of the exposure, identifying each egg so that, if desired,it may be used later in a group with all other eggs laid by the same hen 204 Earl W. Benjamin place by small circles of stock film made by cutting strips of film about3 inches long and J inch wide and gluing the ends together. These filmcircles are transparent, thus casting no shadow, and are therefore muchmore suitable than if made of an opaque substance such as cardboard ormetal. When the twelve eggs that are to be reproduced on each 9x11-inch sheet are placed on the film, they are arranged evenly by meansof a separate frame shown in figure 9, which divides the 9x11-inchspace into twelve equal parts. This frame is removed before the repro-duction is made. After the frame with the eggs on it is in place underthe light, the light is turne

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