We're all after water
... Ellen and Ian finding it, me and Mike B purifying
it, Jonathan perhaps finding it with a Mars Rover.
Mike B and I decide to separate the tasks - I need
to boil the water for at least ten minutes to kill all
the bugs, and he will filter it. Of course, I could
simply throw it on a fire in a tin but I'd probably
lose too much by evaporation, get junk in it from the
fire, and I wouldn’t be able to see when it began
to boil anyway. The sun's so intense here - I must be
able to use its energy to boil water.
Ellen and Jonathan boiled water in Series 2 in Cariacou,
so I could just use a parabolic mirror. But they take
a lot of time to make and they just focus the light
onto one point. I decided to try a funnel-shaped mirror,
so that the light is focused all along the length of
a whole jar with water in it, so the heating effect
is spread out more.
Given we have the tin foil, it's relatively straightforward
to focus light. I managed to build a funnel, find some
jars with decent seals and spray them black so they'll
absorb energy well. I had a go at getting them hot in
the sun too. Not quite sure they'll boil water though.
Played around with a few different shapes of funnel,