[Geiger had discovered the detection principle, but it was still a couple years before counters were actually practical, widely used equipment. And the wizarding world tended to be rather farther behind the technological curve than the Muggles were.]
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timeasmymeasure
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Date: 2017-05-07 07:30 pm (UTC)...I'm sorry, a what?
[Geiger had discovered the detection principle, but it was still a couple years before counters were actually practical, widely used equipment. And the wizarding world tended to be rather farther behind the technological curve than the Muggles were.]