I got from a friend a tiny tin toy turbine.

I connected that with a coffeemaker,
where I extended the
tube where the hot water and steam comes out,
with a plastic pipe,
which goes into the inlet tube of the turbine.

It works well.
There is very little power, of
course, because the turbine
is made with the vanes
of flat metal sheets.
About 5 cm in diameter.
But it goes fast.

I will later send pictures of this experiment
when I get my film from a lab.

Basically the coffee maker works exactly
with the principle as described earlier.

I think that Andrew's suggestions
are just right.
As the flash tube, a metal tube works
and we need no pressure to get water in.

There is a small very hot chamber and
a ball valve letting
the cool water to come in to the hot tube.
The other end of the hot tube is open.

That system of the coffee maker
of course works with electric heating
for the hot chamber.

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But you can use any heat of course.
Solar heat, too.
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If you will try to duplicate the experiment you
might have to modify the valve, which lets
the water in to the hot tube.
Mine was just suitable
broken so that it lets the water in as small droplets,
when the water is quite finishing.
Or maybe the extra pressure from the extended
tube made the valve leaking.

Next I have to ask somebody to make for me
a little bit bigger turbine,
which I could connect to a bicycle dynamo.

I will maybe visit a workshop
to ask them about the prices to make a small
crossflow turbine.
Or a Pelton wheel as suggested by Andrew.

I've got one solar concentrating mirror
of 80 cm in diameter,
made of a satellite antenna.
Glued a kind of chromium tape on it.

I've once tried to run a toy piston steam engine
(with a normal boiler) with that mirror.
It works well.

Of course this kind of solar turbine is quite
inefficient, however good technology
we will use for the turbine wheel,
but that is not necessarily
a problem. Solar energy is practically unlimited.

The main thing is to make the system cheap and
possible to be built with really low level
technology so that any blacksmith in developing
countries can make it.

The clockwork for moving solar mirror is maybe
the trickiest part of the project, but
Scheffler lens people have already shown how
to make a clockwork simple using mainly
bicycle parts.
(Please see the link provided above.)