W dniu 2014-09-09 22:47, J.F. pisze:
> http://en.wikipedia.org/wiki/Oxford_Electric_Bell
>
> Jak oni to zrobili ?

któż to wie... rozebrać i obadać

What is most interesting, and mysterious, about the apparatus is the
internal composition of the 'dry pile' batteries. It is known that they
have been coated with an insulating layer of molten sulphur in order to
protect against atmospheric damage (i.e. moisture), then connected in
series at their lower end to the two bells.

Their interior is suspected to be similar to that of Zamboni piles (an
early electric battery invented by Giuseppe Zamboni in 1812), as records
of popular curiosities of the same time period have been found. This
indicates that the dry pile batteries are probably composed of
alternating layers of metal foil and paper coated with manganese dioxide
that may be several thousand layers, or discs, thick.


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