 | Charles W. Vincent, James Mason - 1858 - 364 pages
...after Itaving been exposed to light, retains in darkness some impression of this light. M. Nienpce remarks — "The phosphorescence and the fluorescence...has been kept many days in obscurity, and of which one-half has beep, covered by an opaque screen ; then apply this engraving upon a very sensitive photographic... | |
 | 1859 - 448 pages
...any body, after having been exposed to light, retains in darkness some impression of this litjld. M. Niepce remarks — "The phosphorescence and the fluorescence...has been kept many days in obscurity, and of which one-half has been covered by an opaque screen; then apply this engraving upon a very sensitive photograph... | |
 | 1859 - 450 pages
...after having been exposed to light, retains in darkness some impression of tliis light. M. Nic'pco remarks — "The phosphorescence and the fluorescence...has been kept many days in obscurity, and of which one-half has been covered by an opaque screen ; then apply this engraving upon a very sensitive photograph... | |
 | 1859 - 348 pages
...darkness tome impression of /Ji's liyht. M. Niepeo remarks — "The phosphoreseenee and the fluoreseenee of bodies are well known, but I am not aware that any experiments have ever been made on the subjeet whieh I am abont to deseribe." Expose to the direet rays of the sun, during a qnarter of an... | |
 | 1859 - 478 pages
...darkness some impression of 0lls Kyht. II. Niepeo remarks — "The phosphoreseenee and the fluoreseenee of bodies are well known, but I am not aware that any experiments have ever been made on the subjeet whieh I am abont to deseribe." Expose to the direet rays of the sun, during a quarter of an... | |
| |
The phosphorescence and the fluorescence of bodies are well known, but I am not aware that any experiments have ever been made on the subject which I am about to describe." Expose to the direct rays of the sun, during a quarter of an hour at least, an... 