My friend Dee Maguire reminded me recently of some very useful videos on teachers tv of physics teacher David Robinson in action. Some of these are also on youtube:
The magnetic gun is also referred to as a ‘Gaussian gun’.
We had a bit of fun puting a basic one together at the end of class the other day.
Other video clips of David demonstrating can be found here on teachers tv; the radioactivity clip is particularly impressive.
You can also enter his name into the youtube seachbox for other demonstrations.