[GBlist] running cost free dehumidifier

[Jim Howarth <howarth@sloe-wine.demon.co.uk>]

About 40 years ago there were advertisements in England for a device
which attracted water from damp air without the need for a power source:
the collected water could be poured away and the device reused again and
again.  There was no need to dry any component in the oven.

I have not heard of any since.  Does anyone know how effective it is,
where to get one or how to build one?

I seem to recall that this involved crystals of sodium carbonate or
sulphate thinly coated with plastic.
-- 
Jim Howarth

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