Thomas, Akira, John,
Thank you for commenting.
Akira,
I don't have any pictures of the rig, but it is quite simple:
an open-sided cube made from thin wood, with non-strobed lights angled down at 45 degrees and aimed to bounce back up and through the top of the cube. A ring with handle (can be home-made from a coat hanger) which will sit on the top of the frame.
a large container to hold the dishwashing detergent/glycerol mix (I forget the ratio of ingredients).
dip the ring in the liquid mix and quickly rest the ring on the frame, look through tripod mounted camera and quickly shoot before soap film thins and breaks (usually no more than two or three seconds).
This description is from memory, and I have undoubtedly omitted some vital information so I suggest Googling "Soap film photography" to find a number of articles and tutorials on the subject.
Robert