The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada
The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada
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In our eReader you can find the full English version of the book. Read The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada 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 The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada
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It remains, however, to consider when we may expect that a mixture of iodide with bromide will act prejudicially. This will be when the number of particles of iodide acted upon by light (and which are undevelopable and consequently a cause of diminu- tion in sensitiveness) bear such a proportion to the particles of bromide that the increased affinity oi iodine over bromine for gelatine is more than counterbalanced. The exact theoretical figures are very difficult to give, but we should say that... if a surface contains one-tenth of iodide to one of bromide the sen- sitiveness would remain the same as when none was used, while with one-twentieth there should be a small increase.
Now as regards the physical state of the silver, we have shown that the addition of iodide acts as a restrainer to fog and is, of course, not the least a destroyer of the image. In other words, it means that you can use more ammonia and less bromide when developing it. For instance, in the albumen-beer pro- cess with the bath* the image is developed with strong ammonia and pyrogallic acid, and with no restrainer whatever beyond the physical restraint caused by the albumen and the iodide.
What to read after The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada?
You can find similar books in the "Read Also" column, or choose other free books by Maclean John to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It remains, however, to consider when we may expect that a mixture of iodide with bromide will act prejudicially. This will be when the number of particles of iodide acted upon by light (and which are undevelopable and consequently a cause of diminu- tion in sensitiveness) bear such a proportion to the particles of bromide that the increased affinity oi iodine over bromine for gelatine is more than counterbalanced. The exact theoretical figures are very difficult to give, but we should say that... if a surface contains one-tenth of iodide to one of bromide the sen- sitiveness would remain the same as when none was used, while with one-twentieth there should be a small increase.
Now as regards the physical state of the silver, we have shown that the addition of iodide acts as a restrainer to fog and is, of course, not the least a destroyer of the image. In other words, it means that you can use more ammonia and less bromide when developing it. For instance, in the albumen-beer pro- cess with the bath* the image is developed with strong ammonia and pyrogallic acid, and with no restrainer whatever beyond the physical restraint caused by the albumen and the iodide.
What to read after The Hero of the Saskatchewan : Life Among the Ojibway And Cree Indians in Canada?
You can find similar books in the "Read Also" column, or choose other free books by Maclean John to read onlineMoreLess
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