| |
| | The Inventions, Researches and Writings of Nikola Tesla |
 | | The ideal way of lighting a hall or room would, however, be to produce such a condition in it that an illuminating device could be moved and put anywhere, and that it is lighted, no matter where it is put and without being electrically connected to anything. |
 | | Mechanical and Electrical Oscillators, August 25, 1893, before a meeting of the International Electrical Congress at the Columbian Exposition in Chicago. |
 | | The light effect is, however, considerably increased by the use of phosphorescent bodies such as yttria, uranium glass, etc. A difficulty will be found when the phosphorescent material is used, for with these powerful effects, it is carried gradually away, and it is preferable to use material in the form of a solid. |
| www.tfcbooks.com /mall/more/313irw.htm (4159 words) |
|