 | Smithsonian Institution. Board of Regents - 1911 - 846 pages
...the aid of the new dry plates, with gelatin fllms, introduced by Mr. Kennett, I was able to take up again, and this time with success, the photography...for this reason, as I soon found to be necessary in this climate, it can be exposed again to the same object on succeeding nights; and so make up by successive... | |
 | 1897 - 1044 pages
...observatory, over the process of Daguerre, and even over that of wet collodion. The silver-bromide gelatine plate, which I was the first, I believe, to use for...for this reason, as I soon found to be necessary in this climate, it can be exposed again to the same object on succeeding nights ; and so make up by successive... | |
 | 1897 - 1074 pages
...observatory, over the process of Daguerre, and even over that of wet collodion. The silver-bromide gelatine plate, which I was the first, I believe, to use for...for this reason, as I soon found to be necessary in this climate, it can be exposed again to the same object on succeeding nights ; and so make up by successive... | |
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The silverbromide gelatine plate, which I was the first, I believe, to use for photographing the spectra of stars, except for its grained texture, meets the need of the astronomer at all points. This plate possesses extreme sensitiveness ; it is always... 
