Archive for April, 2009

Mercury lamp spectrum

Friday, April 24th, 2009

The  un-done demo of the day is the 4 meter wide spectrum of mercury vapor, visible lines on a screen and the ultraviolet lines detected with a hand held screen. With three colored plexiglas sheets was demonstrated absorption spectroscopy.  The yellow plastic absorbed the violet line and glowed fluorescently yellow.  The ...

Honeypots for pirates

Tuesday, April 14th, 2009

No links today.  Just a word or two about pirates, and ambiguity. Like many Americans, I was happy to hear that the captain in the lifeboat was saved.  He is a brave  man who was willing to die for his crew.  The pirates were stupid, and in the world of ...