What exactly does a thyristor do on an old Brit (BSA) bike?

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RapidFire1

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It's a finned housing mounted under the head light with a few wires running into it. What does it do?
 
I've got no idea, but you can check out manuals from 1913 on @ this site
http://www.carlsalter.com/motorcycle-manuals.asp
http://en.wikipedia.org/wiki/Thyristor
 
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