Hi Piers et al; Piers wrote
>
> I found an old email from Bob Shell regarding Zinc-Air and Wein cells (of
> which he is the co-inventor), which may be of interest. The relevant
> extract:
>
> "The Weincell is a compromise. It works just like mercury cells, but has a
> much shorter life. We modified the electrolyte to match the discharge curve of
> mercury cells and made the air holes smaller to lengthen life, so they do work
> better than generic zinc air cells. They last much longer in humid climates.
> What kills them is evaporation of water from the gel electrolyte inside, so
> keeping them moderately humid is essential for long life. "
And a moderately moist atmosphere is what kills lenses as it favours fungus.
I'd rather have good lenses.
Brian
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