another carbon #arc-lamp #video #formina; he strikes the arc at 6'17". It turns out to be from a movie projector.
on 02024-06-04#video of enclosed carbon #arc-lamp. He demonstrates an Adams & Bagnall 133-Hz 110-volt 7-amp arc lamp designed for 75 volts across the carbon electrodes, warning that if you run it on lower frequencies its parts may overheat. He does eventually get to showing its workings at about 11 minutes, demonstrating the negative feedback #mechanisms that maintain the arc at the right length. He finally turns it on at 18'45".
on 02024-06-04