Big Bertha Thing Positive
Cosmic Ray Series
Possible Real World System Constructs
http://web.onetel.com/~tonylance/positive.html
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Round photographic plates.

Caption;-
A photograph of great historical interest.
The track is one left by a positron. This positron possessed,
an energy of 63 MeV, before entering the lead plate from below;
after penetrating the 6 mm. lead plate, it proceeded with an
energy of 23 MeV. This change of energy, shows definitely,
the direction of motion of the particle and, therefore, allows
one to conclude, that it is positively charged.