Battery–capacitor flash
A battery–capacitor flash (BC flash) is a flash photography system used with flashbulbs. Instead of relying directly on the current pulse ability of a battery to directly fire a flashbulb, a battery is used to charge a capacitor that is then discharged through the flashbulb. BC flash units use 5.6V, 15V, or 22½V batteries.
Polaroid BC flash model 281
Advantages
The advantage is that even with an aging battery, the flashbulb still gets a high current pulse and thus reliably fires, although the recycle time between flashes increases as the battery ages.
gollark: You should have perms for that now also.
gollark: ++tel init_webhook
gollark: Also notable is that apparently floating point inaccuracies in the neural network make the hashes turn out differently on different devices. Yet the cryptographic system doing the matches is only able to do *exact* matches, not hamming distance or something.
gollark: That wouldn't stop this sort of attack from working.
gollark: There are other possible uses, though. Someone with illegal material could just set the hash to some random value without making the image look particularly weird.
See also
References
- Electronics for Photographers, by Marshall Lincoln, Copyright 1966 by Chilton Books, pp 43–54.
- Capacitors & Batteries, Boston University Physics Department
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