Complete Self Instructing Library of Practical Photography volume 9
Complete Self Instructing Library of Practical Photography volume 9
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In our eReader you can find the full English version of the book. Read Complete Self Instructing Library of Practical Photography volume 9 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Complete Self Instructing Library of Practical Photography volume 9
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In place of the bull's-eye condenser, and where gaslight is used as the illuminant, the Welsbach gas lamp with metal chimney and iris diaphragm, and bull's-eye lens, as shown in Illustration No. 125, page 344, may be used. This illus- tration represents an ordinary Welsbach lamp fitted with a metal hood which cuts off all unused light, and the lens barrel, being supplied with an iris diaphragm, concentrates all the light on the object. By the adjusting of the iris diaphragm you can illuminate t...he structure of the mantle of the lamp. Where no diaphragm is used a ground-glass may be placed between the burner and the microscope in the same manner as the color-screen in Fig. 3, of Illustration No. 124. Without the ground-glass or diaphragm the struc- ture of the mantle would appear in the picture.
687. Reflected and Transmitted Light After the question of illuminant has been settled, we next have the nature of the object to be photographed to contend with. While most of the subjects selected to be photographed are sufficiently transparent to be illuminated by light trans- mitted from the mirror, yet some subjects, such as minerals, shells and plants, are so dense in their structure that direct light such as would be used with the instrument arranged horizontally, or the light reflected from the mirror below the stage will not pass through them and, therefore, will need to be photographed from their reflected surface in 354 Library of Practical Photography.
What to read after Complete Self Instructing Library of Practical Photography volume 9?
You can find similar books in the "Read Also" column, or choose other free books by J B James Boniface Schriever to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In place of the bull's-eye condenser, and where gaslight is used as the illuminant, the Welsbach gas lamp with metal chimney and iris diaphragm, and bull's-eye lens, as shown in Illustration No. 125, page 344, may be used. This illus- tration represents an ordinary Welsbach lamp fitted with a metal hood which cuts off all unused light, and the lens barrel, being supplied with an iris diaphragm, concentrates all the light on the object. By the adjusting of the iris diaphragm you can illuminate t...he structure of the mantle of the lamp. Where no diaphragm is used a ground-glass may be placed between the burner and the microscope in the same manner as the color-screen in Fig. 3, of Illustration No. 124. Without the ground-glass or diaphragm the struc- ture of the mantle would appear in the picture.
687. Reflected and Transmitted Light After the question of illuminant has been settled, we next have the nature of the object to be photographed to contend with. While most of the subjects selected to be photographed are sufficiently transparent to be illuminated by light trans- mitted from the mirror, yet some subjects, such as minerals, shells and plants, are so dense in their structure that direct light such as would be used with the instrument arranged horizontally, or the light reflected from the mirror below the stage will not pass through them and, therefore, will need to be photographed from their reflected surface in 354 Library of Practical Photography.
What to read after Complete Self Instructing Library of Practical Photography volume 9?
You can find similar books in the "Read Also" column, or choose other free books by J B James Boniface Schriever to read onlineMoreLess
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