Yes, did mean to say seeing the trail left in the cloud chamber (from the link). The article didn't specifically say that you could identify a passing c ray by a certain path and shape, just other ones.
I'd read a few short blurb articles last few days collected from different sources from last three or four years and one would say evidence from here and then disproved and other possible sources, so it was difficult to tell from them if there was a solid likely source
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