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Creating a running soap film in the channel

 Let a bit of soap water flow out of the feeding container, so that the area between the wires and the edge of the container is covered by soap water. Then use a flexible ruler (or other thin plastic plate) to drag a film all the way down to the terminator. It is very important to push the ruler all the way up to the holes in the container before you start dragging the film. This operation demands a bit of experimenting and "fingerspitzgefühl".