Day Two

I try out an alternative material for the funnel. The tin foil is easy to use, but it creases up too easily, scattering light in lots of different directions. So I cut a funnel out of thicker metal. It's a bit of a nightmare to handle, but will do the job better I think.

I also try out a black pot, between glass sheets, inside an inner tube. It actually worked quite well, but nowhere near boiling. Hmm ... this may be a harder challenge than I'd thought.