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Excerpt from Radium und Andere Radioaktive Substanzen: Unter Besonderer Benutzung Eines von Elektro-Ingenieur William J. Hammer, New-York, Vor dem American Institute Of Electrical Engineers und der American Electrochemical Society am 17. April 1903 Gehaltenen Vortrages
Wenn man mittels fluoreszierender Substanzen Blumen auf Kartons zeichnet, so erzielt man wunderbare Effekte, 'wenn man Licht, das vorher ein dunkelblaues oder violettes_ Farbglas passiert hat, auf die vorher unscheinbaren Zéich nungen fallen lässt; auch Natriumdampf fluoresz'iert lebhaft im Sonnenschein.
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