A Manual of Photographic Chemistry Theoretical And Practical
A Manual of Photographic Chemistry Theoretical And Practical
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In our eReader you can find the full English version of the book. Read A Manual of Photographic Chemistry Theoretical And Practical 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 A Manual of Photographic Chemistry Theoretical And Practical
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The time of exposure to light varies much with the density of the Negative and the power of the actinic rays, as influenced by the season of the year and other . DETAILS OF FEINTING. 499 obvious considerations. As a general rule, the best Nega- tives print rather slowly ; whereas Negatives which have been under-exposed and under-developed, print quickly.
In the early spring or summer, when the light is power- ful, about ten to fifteen minutes may be required ; but from three-quarters of an hour... to an hour and a half may be allowed in the winter months, even in the direct rays of the sun. It is always easy to judge of the length of time which will be sufficient, by exposing a small slip of the sensitive paper, unshielded, to the sun's rays, and observing how long it takes to reach the coppery stage of reduction. Whatever that time may be, nearly the same will be occupied in the printing, if the Negative be a good one.
In a dull London light, the Writer has seen four days spent in getting one impression from a Negative ; but pic- tures so obtained are not equal to others printed by a stronger light.
What to read after A Manual of Photographic Chemistry Theoretical And Practical?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Frederick Hardwich to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The time of exposure to light varies much with the density of the Negative and the power of the actinic rays, as influenced by the season of the year and other . DETAILS OF FEINTING. 499 obvious considerations. As a general rule, the best Nega- tives print rather slowly ; whereas Negatives which have been under-exposed and under-developed, print quickly.
In the early spring or summer, when the light is power- ful, about ten to fifteen minutes may be required ; but from three-quarters of an hour... to an hour and a half may be allowed in the winter months, even in the direct rays of the sun. It is always easy to judge of the length of time which will be sufficient, by exposing a small slip of the sensitive paper, unshielded, to the sun's rays, and observing how long it takes to reach the coppery stage of reduction. Whatever that time may be, nearly the same will be occupied in the printing, if the Negative be a good one.
In a dull London light, the Writer has seen four days spent in getting one impression from a Negative ; but pic- tures so obtained are not equal to others printed by a stronger light.
What to read after A Manual of Photographic Chemistry Theoretical And Practical?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Frederick Hardwich to read onlineMoreLess
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