In the January 1983 issue of the American Journal of Physics, Edward Purcell published a one-page "Round-Number Handbook of Physics" (see e.g. http://lemeshko.blogspot.com/2008/06/one-page-round-number-handbook-of.html). In the section on unit conversions, one line reads: "pc(eV) = 300 Br(G cm)". Does anyone have any idea what this means? I note that 1 eV/(G cm) seems to be closely related to the elementary charge, but I still can't quite figure out what this line is about.
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